On Sunday Kourtney Kardashian headed to a birthday party in Los Feliz with Mason and baby Penelope, and it's a good thing both of her kiddies were on their best behavior, because she really had her hands full!

Earlier in the day Kourt tweeted, "Missing our Greece vacation!! So excited to relive the memories on tonight's #KUWTK episode..." This family never stops promoting themselves ... but does momager Kris Jenner have to remind everyone to tweet about their reality show or is that a chore for one of their many assistants?

Evan Ross and Ashlee Simpson are inseparable!

On Saturday night Evan took Ash to his mom's concert with the Los Angeles Philharmonic at Hollywood Bowl, and X17 photographers snapped the lovebirds on the way out.

The two made their first formal appearance last week at Ashlee's sister Jessica's clothing launch party in New York City, and the first time we ever saw them together was on July 1, when they left the Roosevelt Hotel together.

Think it's true love? Or just a summer fling?

Gisele Bundchen wished Tom Brady a happy 36th birthday on Saturday, posting the black and white shot above on Instagram and writing, "Happy birthday my love! Thank you for being the best husband, father and friend. Thank you for being you. I love you so much." Awww!

Tom and Gisele got married in 2009, and they have two children together, Benjamin and daughter Vivian, who was born 7 months ago.

We don't know who's luckier ... Tom or Gisele!

There's a chance he could go to jail for a probation violation, but that doesn't mean Chris Brown can't party it up in the meantime! Last night the R&B bad boy stopped by a club in Hollywood with pal Wale, and oddly enough, the boys weren't joined by any females.

The night before that, Rihanna arrived at Playhouse at 2:20am, which was just a few minutes after Karrueche Tran left the club with a male pal. Rihanna will be back in town for several weeks, Chris is single, Karrueche doesn't seem to mind the back and forth relationship with Chris and all three of them like to hit the clubs, so we're guessing there will be some sort of drama before the summer ends...

Looks like he had a good time though!

Miley Cyrus appears in Big Sean's new music video for "Fire," and she looks hotter than ever.

So why pick a 20-year-old former Disney starlet to sex up his latest vid? Sean tweeted, "[It's] a special video for a special song. I got Miley Cyrus for this video because she's somebody who's had a personal evolution as a lot of us have had. Besides all the personal stories I tell in the song, there are so many other ways people can make it through the fire."

He added, "I think Miley did a great job as a metaphor for strong women, being strong person after heartbreak (hence the burning pic that could symbolize her old romance), or maybe even deeper problems but in the end remaining as elegant as a rose. It's a cool visual that has a cool concept and meaning to it."

Wait, heartbreak? Is he referring to something going on with Liam?!

The Real Housewives of Beverly Hills are back in town!

On Saturday night Brandi Glanville and Kyle Richards and the rest of the ladies landed at Los Angeles International Airport after vacationing (with a camera crew, of course) in Puerto Rico. Everyone was tan and well-rested, and it looks like some of the ladies were ready to keep the party going!

In other news, former beauty queen Joyce Giraud has reportedly taken the place of Adrienne Maloof and joined the cast for next season. Giraud won Miss Puerto Rico two times and was a finalist in the Miss Universe pageant in the 1990s ... maybe that's why the gals headed to PR?

The placement of the "No Smoking" sticker is pretty perfect...

On Saturday Kristen Stewart was snapped riding shotgun in a car on the set of her new film, Camp X-Ray, and it looks like she won't be lighting up in this vehicle!

The 23-year-old starlet may be quite the little chain smoker, but her former beau Rob Pattinson reportedly ditched the dirty habit after the two split this spring. "Rob has finally quit smoking for good. And he feels and looks healthier than ever. Working out has helped him tremendously with regard to quitting smoking," a source told HollywoodLife. "The two just don't go hand-in-hand. Rob is now addicted to exercising and feeling good. Rob has been training diligently with famed celebrity fitness instructor Harley Pasternak. He's determined to get into the best shape of his life."

Hopefully we'll get a peek at his hot bod sooner or later! You know K. Stew is kicking herself over this...

After a busy day of meetings, Teen Mom star turned porn star Farrah Abraham slipped into a fuchsia dress and went to dinner at BOA in West Hollywood.

"I'm Soooo Excited :) tons going on this weekend #LA," she tweeted. "PR conferences & Magazine shoot :) see you around." Playboy reportedly rejected her for a naked pictorial, so we're curious to see which magazine she shot with ... maybe Hustler? And does the surgically enhanced hottie have plans to do more adult films?