Kelly Osbourne Bails, but Which Celebs Attended Kim Kardashian's Bridal Shower?

Before her Las Vegas bachelorette party, reality star was feted in L.A. by lots of famous friends and family members...how come Kelly O canceled?

Before Kim Kardashian left for her big Las Vegas bachelorette blowout Saturday night, she was the guest of honor at a bridal shower in L.A. that afternoon.

The soiree, thrown by momager Kris Jenner at her home, featured an impressive guest list.

Our own Kelly Osbourne was expected at the bash and excitedly tweeted about it Saturday morning, but the Fashion Police cohost canceled in light of her BFF Amy Winehouse's tragic death.

Plenty of other famous faces, however, were on hand to wish the bride-to-be well...

Demi Lovato, Serena Williams and Mel B were all there for their friend.

"Had such a fun time at @KimKardashian's bridal shower. God that family is gorgeous!" Demi tweeted after the party.

Serena also gave the bride-to-be a social media shout-out, saying "@KimKardashian you looked radiant today.love u enjoy this moment. Always amazing seeing you and @KhloeKardashian and @kourtneykardsh."

Mel B had double shower duties on Saturday, attending Kim's bridal shower and Denise Richards' baby shower later that day.

"what a busy day today,i went to @KimKardashian bridal shower then @DENISE_RICHARDS baby shower ahhh i am sooooo tired right now!!" the former Spice Girl tweeted.

We're sure no one was more tired than the woman of the hour herself, who hopped on a private jet to Las Vegas with her mom, sisters and friends to continue partying.

After a late night at Tao and Lavo, where Kris Humphries was celebrating his bachelor party, Kim decided to take it easy on Sunday in Sin City.

She opened sexy lingerie gifts with her girls in her private suite at the Palazzo before noshing on chicken salad, calamari and pizza poolside. After lunch, the girls opted for shopping and massages instead of more partying, but Kris was apparently ready for round two.

Meanwhile, her New Jersey Nets beau spent Sunday at Tao Beach with Jordan Farmar and his sister Kaela. The group drank cocktails and even tossed the groom in the pool before the revelry finally died down.

Guess we know who the bigger partyer is in this twosome!