Celebrity Parties

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Taylor Swift, Ellie Goulding, and Selena Gomez

What happens in Vegas . . . ends up on Instagram?! Swift and her BFFs, including the girls of Haim, threw an epic grown-up tea party in March in their elaborate Las Vegas hotel room. Later, the "Style" singer took her posse to Hakkasan to groove to Calvin Harris' DJ set.

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Jennifer Aniston

Birthday bash at the bowling alley! For Aniston's 46th birthday in February 2015, she rented out the Spare Room inside Hollywood's famed Roosevelt Hotel to party with her fiancé Justin Theroux and A-list BFFs Courteney Cox, Malin Akerman, Isla Fisher, and Amy Adams. Arriving at 9 p.m., the group that also included Jimmy Kimmel and John Krasinski, bowled and played games including backgammon, chess, Monopoly, dominoes, and cards until 1 a.m.

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Rihanna

Life is good for Rihanna, who ushered in her 27th birthday at a February 2015 bash thrown by none other than Leonardo DiCaprio! DiCaprio joined Beyonce, Jay Z, Naomi Campbell, Jim Carrey, and a host of other stars as the birthday girl blew out the candles on a leopard print three-tier cake. "Bill Murray tore up the dance floor with Mick Jagger," a source told Us.

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Dierks Bentley

Scottsdale, Ariz., native Bentley ushered in February 2015's Super Bowl XLIX by hosting a party at his hometown bar, Whiskey Row. "It's fun having your local bar actually have your name on it. I used to come down to these bars with my fake ID," the owner — joined by Florida Georgia Line, Jason Aldean, Kid Rock, and Lady Antebellum at the party — told Us.

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Kourtney Kardashian

Shortly before giving birth to her third baby, son Reign Disick, Kardashian was showered with love by her BFFs and sisters at a November 2014 Breakfast at Tiffany's-themed brunch at Beverly Hills' Montage Hotel.

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Glee Cast

Going out with a bang! To celebrate the end of their six seasons on the FOX musical comedy, Lea Michele and her costars were treated to a carnival party on the Paramount Studios set of their show, and let loose later on that night at Elevate Lounge nightclub in L.A. "It was fun. They cut together a bunch of clips that everyone watched," a source told Us of the February 2015 fete for the cast and crew. "People were drinking and dancing."

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Christoph Waltz

Have burger, will party! Waltz may have been beat by Michael Keaton for a Best Actor at the 2015 Golden Globes, but the Big Eyes star partied with another hot accessory in hand at the Netflix afterparty: a Fatburger cheeseburger! Mingling with guests including costar Amy Adams at the Weinstein Company bash, Waltz noshed on his burger in most of the evening's photos.

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Channing and Jenna Dewan Tatum

The Magic Mike star and his wife (who met on the set of dance flick Step Up) showed off their best moves at The Weinstein Company & Netflix's Golden Globes afterparty in 2015, letting loose in their black-tie attire at The Beverly Hilton hotel.

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Beyonce and Jay Z

To celebrate the Oscars 2015, Bey and Jay joined Julianne Moore, Eddie Redmayne, and other trophy winners at Vanity Fair's annual Academy Awards afterparty. "Everybody went nuts!" one party guest told Us. "You're not supposed to take pictures of celebs inside but when Beyonce and Jay Z came, everyone whipped out their phones!"

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Sofia Vergara and Derek Hough

Too sexy for her dress! Hough pulled Vergara onto the dance floor at HBO's 2014 Emmys afterparty once "Footloose" came on, and the pair danced so hard that she suffered a nip slip in her Roberto Cavalli gown! "It was a full five minutes of him spinning her around the dance floor," an observer told Us. "No one could quite believe what they were seeing, nor were they able to take their eyes off of it."

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Kim Kardashian, Kanye West and More

Only in Ibiza! Kardashian and her husband joined Zac Efron, Paris Hilton, and Diddy to celebrate Ricardo Tisci's 40th birthday in Ibiza, Spain, in August 2014. In the pic from the Givenchy designer's bash, Diddy photobombs West and Efron as Kardashian and former frenemy Hilton catch up on a couch in the background.

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Kristen Wiig and Melissa McCarthy

Who you gonna call?! Wiig and McCarthy joined their costars in the all-female Ghostbusters reboot — Leslie Jones and Kate McKinnon — at the Plaza Hotel afterparty for Saturday Night Live's 40th anniversary in February 2015. "OK, I'm exhausted but this week was epic!" Jones captioned a Twitter pic of the foursome.

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Lance Bass

Ahead of his December 2014 wedding to Michael Turchin, the former 'N Sync star was celebrated at a joint Mardi Gras-themed bachelor party at L.A.'s famed gay bar The Abbey. Filmed for the couple's E! wedding special, the wild bash paid homage to their New Orleans engagement and included a racy game of "Pin the Penis on the Pop Star," which featured Bass' face on a stripper's body.