Hilary Duff and Mike Comrie spend a LOT of time together for two people who are separated ...

We caught up with the parents at the supermarket on Saturday (who grocery shops with their estranged hubby?) with son Luca. The pair bought flowers (quite a domestic, couple-y thing to buy!) and headed home. And it was only the night before that the two were together at Cindy Crawford and Rande Gerber's Halloween party ... as a couple.

But only a month ago, Hil told E! News : "I mean, if there wasn’t a chance for getting back [together], I think we would’ve filed for divorce." Well ...

Kim Kardashian and Kanye West took off from LAX to San Francisco Sunday afternoon -- in color-coordinated outfits, of course!

Kim wore her favorite Balmain leather jacket with a tight black top and grey denim, with nude suede pumps, while Kanye sported a velvet sweatshirt, black jeans and his fave brown suede boots.

No Nori in sight! Though I'm sure she would have been dressed in black as well ...

Justin Bieber's a PIMP!

Rolls Royce Phantom ($500K), Falcon 2000 LX jet charter ($5K/hour). Crazy. Love him. #SelenaShouldaKeptHimClose

Joel Madden and Heidi Klum took their little ones to the soccer field, on Saturday. The weekly ritual is an interesting one in LA ... imagine us "regular people" taking our children to AYSO where you sitting in folding chairs next to Heidi Klum or Reese Witherspoon, for example. Imagine Joel Madden is your kid's coach. Imagine the guy next to you runs a $1 billion hedge fund and is closing a multi-million dollar deal on his cell as he cheers when his child scores. Well that's what it's like here, in LA. Us "regular people" mingle with the R&F (rich and famous) on the daily. Because in the end, stars us just like us, right?!

Paris Hilton didn't disappoint this Halloween season! The heiress with killer bod and sexy style donned a bad-girl bunny costume in turquoise for Seth MacFarlane's annual bash and then for the yearly Playboy Mansion party.

And who helped her pick out this daring look? Her pup Prince Hilton, of course! Paris' adorable BFF accompanied her to Trashy Lingerie earlier in the day to choose the costume. The pair turned up in matching yellow, the teacup Pomeranian curled up in Paris' arms. We almost with Prince had a matching sexy bunny costume ... we'd love to see THAT!

Kylie Jenner kept her face covered as she left Tempt boutique in Calabasas Saturday, as we peppered her with questions about supposed boyfriend Tyga, with whom she just vacationed in Paris.

In an X17online poll, 86% of you said the relationship between 17 year-old Kylie and 24 year-old Tyga inappropriate.

The rapper recently told Vibe magazine, when asked if he is dating the Kardashian-klan socialite who's seven years his junior: "See the thing about Kylie… I've known Kylie and the whole family for four years. I introduced [my ex] Blac Chyna to Kim about a year ago. So everybody's been cool ... It's just so hard, their world is different. If somebody wanna hang out, cool., I'm not opposed to hanging out with somebody. I hand out with her [Kylie], her sister [Kendall], I hand out with Scott [Disick] sometimes, I hang out with Khloe sometimes. But people wanna take the situation [with Kylie] to the next level."

"People," like Tyga and Kylie, maybe :)

And by the way ... we may be in LA, folks, but this is NOT what a teenage girl usually wears to go shopping at a local boutique ...

Kim Kardashian, Kanye West invited momager Kris Jenner and her new boy toy Corey Gamble to celebrate KK's 34th birthday in Las Vegas at Tao -- the May-December couple even joined Kimye on their private jet.

So just WHO is this guy Corey that the 58 year-old grandmother is dating? It's Justin Bieber's co-manager -- who works with Scooter Braun and he's reportedly in his early 40s.

Kris had a lot to keep up with, as daughter Kim busted out in a white dress with plunging neckline for her birthday bash at Tao. Khloe kept it simple in a little black dress with black workboots (yikes!) and Kanye wore a patterned sports coat in black-and-white.

So back to Kris' boy ... he supposedly told OK! magazine he met Kris at Ricardo Tisci's birthday bash: "I approached her and found out we actually lived pretty close to each other." The pair were snapped at a Calabasas restaurant out on a date last week. Gamble told the mag, "That worries me and I'm hoping it's not a setup from Kris because I do really like her."

Looks like this romance is heating up!

Getty Images for CBS

Taylor Swift rocked the Hollywood Bowl Friday night, with celeb guests like Gwen Stefani in attendance to support the We Can Survive breast cancer awareness charity. Iggy Azalea, Pharrell Williams, Ariana Grande and other A-listers performed as well.

In a sequined crop-top and white hot pants, the "Shake It Off" singer has been battling online piracy as of late -- songs from her upcoming album 1989 were leaked online, though her record label promptly issued cease-and-desist orders and had the songs removed from YouTube and other sites. The album will be officially released October 27.