Whoa!!! Tyga flew solo for his birthday last night -- "girlfriend" Kylie Jenner was NOWHERE in sight!

As X17online reported on Monday, Kylie looked downcast after spending the weekend away from long-time boyfriend Tyga. She sought solace in a male friend over lunch in Calabasas.

Then, Kylie and Kendall jetted off to Australia to promote their new Topshop line -- putting her out of Tyga's reach until yesterday, when they returned.

The pair haven't even visited since Kylie's return and something SERIOUS happened because she skipped her homie's 26th birthday bash last night at The Nice Guy. NONE of the Kardashian-Jenners were there and frankly, the night seemed super boring -- with a bunch of dudes walking around in "Twelve" caps and slapping each other on the backs while they downed Remy Martin.

So just what happened? Well, some outlets are reporting Kylie's upset after being reminded of Tyga's alleged affair with transgender model Mia Isabella.

After Charlie Sheen announced this week he's HIV-positive, Kylie did the sexual six degrees of separation math and traced Charlie's ex, Capri Anderson, to Mia -- the two were roommates back in the day. There's reportedly a sex tape with the two "girls" -- meaning, the potentially infected Capri could have infected Mia, who could have infected Tyga. Which means Blak Chyna, their son King Cairo and ... KYLIE could have been exposed. Is THAT was the breakup's all about???

Another one bites the dust!

Kate Beckinsale and husband Len Wiseman have separated after 11 years together, multiple outlets are reporting. The news comes on the heels of the Live Free or Die Hard director being spotted with model CJ Franco on three separate occasions just this month. It sounds like Len is already moving on to greener pastures, but it doesn't seem to be bothering the British actress.

"They are still friendly and spend time together in L.A. when Kate is there. There has been no drama," a source dished to People. "It's just not Kate's style. They have both had complicated schedules and have grown apart," the source added.

The pair met while filming Underworld in 2003 and tied the knot in 2004. The brunette beauty has 16-year-old daughter Lily with former partner Michael Sheen, but Wiseman has been like a father figure to her. "[Wiseman's] primary concern in all of this is Lily. He loves his stepdaughter and is there for her," the source divulged.

Does anybody stay married these days?!

Whoa!

Rose McGowan is known for her "no-f**k's given" attitude, so it doesn't surprise us that the actress acted on a whim and decided to shave all her hair off! "I don't want it anymore #rebelyell #everythingisart starring @hairbyadrian," she captioned a video of her stylist Adrian Arredondon buzzing off her pixie cut.

"No hair don’t care. Honestly, it’s liberating," she added.

The Scream star recently made headlines for slamming Caitlyn Jenner over her comments that the hardest part of being a woman was "figuring out what to wear," so it seems she's proving her point that females are more than just looks.

If she didn't have such a pretty face, this could have been really bad!

She's doing her part!

Caitlyn Jenner and her pal and I Am Cait co-star Chandi Moore taped this anti-violence video to mark the Transgender Day Of Remembrance, and we're glad that the reality star is focusing on something other her glam routine for once.

"No one should be killed simply because they are transgender," the 66-year-old begins. Although the E! starlet has no clue how hard it is for the general public to transition, at least she's using her spotlight to spread a message of acceptance.

"Hire a trans person in your company, support a trans student in your school, love your trans child. Let's all take action to put an end to hate and violence," she urges.

Hey Cait, maybe while you're on this "be accepting" kick you can get behind gay marriage!

Shameless self promotion runs in the family, eh?

Khloe Kardashian took part in a little bit of shameless promotion when she shared the above photo of her nieces, North West and Penelope Disick, holding a holding a copy of her new book, "Strong: Looks Better Naked."

“I can't stop smiling when I look at this photo!" she captioned the shot. "I love my little ladies!! They were so excited and kept screaming ‘KoKo! KoKo!’ North calls me ‘KoKo Loco.'" We think it's a little loco for the little girls to be clutching a copy of a book where there auntie appears naked, but keep in mind, their family isn't like yours!

Khloe had been busy promoting her new book, but she was forced to cancel a recent signing after coming down with a infection that required antibiotics and painkillers to treat. Ouch! Feel better Koko Loco...

One Direction performed "Perfect" and "History" on Jimmy Kimmel Live last night, but it wasn't just any show -- they boys had part of Hollywood Blvd. shut down and they performed outside for a crowd of thousands. This is only the second time this has ever happened -- the first was when Taylor Swift took to the streets last year after she released 1989. We snapped the boys before and during their big night, and it looked like they had a blast.

1D are currently promoting their new album, Made In The A.M., and band members Harry Styles, Louis Tomlinson, Zayn Malik, Niall Horan and Liam Payne sat down with Kimmel inside the studio and chatted about their upcoming hiatus. Styles told the late night host he plans on “chilling out” during their break, while Horan added that he wants to travel because the band has been to a handful of countries but only driven past “the biggest monuments in the world.”

Check out more photos in the gallery below of the boys rehearsing before their big show!

Gigi Hadid might as well be an honorary Kardashian at this point!

On Thursday evening the gorgeous model met up with Kris Jenner and her boyfriend Corey Gamble at Cecconi's in West Hollywood, and the starlet rolled with an unidentified blonde gal pal. Interesting! We know she just split from Joe Jonas, so she wouldn't be bringing a man, but wouldn't she be interested in bringing a more relevant BFF along, like say, Kendall Jenner?

Kendall and little sis Kylie got back from Australia the previous day, and Kendall posted a photo of (presumably) herself bent over, with her middle finger covering her crotch. So ... who's that message for?

It's a match made in reality TV heaven!

On Wednesday Scott Disick went house hunting with Million Dollar Listing star/Hollywood realtor Josh Altman. At first we were worried that Scott might be looking for his own place (which doesn't make ANY sense if he's supposedly getting back with baby mama Kourtney Kardashian), but then we remembered that one of LD's favorite pasttimes is flipping homes. Hey, as long as he's staying away from other women and the party scene, we're happy to see him out and about!

Altman worked with Kim Kardashian and Kanye West on the sale of their mansion earlier this year, so clearly he is a family friend -- and maybe LD will be making an appearance on Altman's Bravo show? I mean, we're sure he's getting paid for it!

Disick was previously renting a party pad in Beverly Hills, and he's been staying at Kourt's place for now. Seeing as he's been laying low -- shopping, hanging with friends and now this -- it does seem like he's doing his best to keep his bad boy behavior in check. But hopefully Kourt's letting him eat -- LD looks like he could stand to gain a few lbs!