Jennifer Lopez left younger beau Casper Smart at home for the Oscars red carpet, but the sexy 42-year-old Latina brought the backup dancer to the Vanity Fair party.

We have a feeling Casper, 24, is responsible for that spring in JLo's step. Without a doubt, Ms. Lopez's Zuhair Murad gown is to die for!

See more of the sexy fashions at the Vanity Fair Oscars bash in the gallery below.

It's time for a haircut. 'Nuff said.

Madonna has released her second single "Girl Gone Wild" ... off the MDNA album.

Madge released her first single "Give Me All Your Luvin" featuring Nicki Minaj and M.I.A. at the Super Bowl. The 53-year-old singer will be releasing her upcoming CD on March 26.

This is Madonna's 12th studio album. Love this lady!

Miley Cyrus looked stunning from front to back in her shimmering floor-length Roberto Cavalli dress while entering the Vanity Fair Oscars party with beau Liam Hemsworth.

The 19-year-old "Can't Be Tamed" singer, who rocked bright red lips, Tweeted, "Can’t wait to wear my dress by @RCavalli tonight :) its so stunning xx."

Kate Hudson chose a glamorous red vintage Versace!

See all of the gorgeous fashions at the Vanity Fair party in our gallery below.

We're not sure what Vanessa Hudgens is wearing, but boyfriend Austin Butler doesn't seem to mind!

Over the weekend we spotted the lovebirds out and about in Malibu, and later we caught them going for a drive and making out in the front seat. They've been dating for several months, and they're just as affectionate with one another now as they were back in December. Looks like Vanessa won't be letting go of this one anytime soon! And have you seen Austin shirtless? Do yourself a favor and Google it -- he may not be as famous as Zac Efron, but he's definitely a catch!

Sean Young has been released from the Hollywood LAPD police station after being taken into custody for reportedly slapping a security guard outside the Academy Awards' Governors Ball last night.

We caught the actress at her Santa Monica home early this morning and she told us all about the incident and showed us bruises she claims were sustained during an altercation with a guard.

Young was outside the Oscars bash, taking photos with fellow celebs, when security guards asked the 52-year-old Blade Runner actress to leave the party because she didn't have a ticket, according to TMZ.

That's when the actress allegedly struck the guard and was placed under citizen's arrest for misdemeanor battery.

Young says the arrest is the fault of the Academy's lawyer.

Click thru to see Young posing with Angelina Jolie and Brad Pitt outside the party.

No wonder Nicole Richie has been busting her butt in the gym! She must have been gearing up for this sexy spread in California Style's "C" Magazine.

The 30-year-old actress, who is launching The Nicole Richie Collection by QVC, is showing off some of her designs in the fashion mag.

When asked about her collection, Richie said the following:

“QVC is a well-oiled machine and to be in business with them is so exciting because it gives me an opportunity to design for a much broader range of women. I wanted you to be able to walk into your closet with your eyes closed and pick something special.”

See more fashion photos of Joel Madden's wifey in the gallery below.

The stars flocked to the hottest party of the night ... the Vanity Fair post-Oscars party at the Sunset Towers Hotel.

Victoria and David Beckham made their way into the star-studded party. Posh, 37, was wearing a gorgeous white gown from her own collection with a skinny black belt.

Katie Holmes, wearing a strapless chiffon gown by Elie Saab, was escorted into the party by sexy hubby Tom Cruise.

And a blue-haired and single Katy Perry rocked a shimmery Blumarine gown. Yikes ... may be a good time to get that hair back to normal, girlfriend!

See more stars arriving at the Vanity Fair party in our gallery below.