Happy birthday, Sofia Richie!
The model turned 21 on Saturday and celebrated with her boyfriend of two years Scott Disick, plus Kylie Jenner, and mutual friends Anastasia "Stassie" Karanikolaou, Yris Palmer, Victoria Villarroel and Amber Asaly in Las Vegas.
Sofia kicked off the festivities early at home in Los Angeles, where Scott surprised her with an Aston Martin! Do you like luxury...
The group then jetted off to Sin City, where they spent the afternoon at Encore Beach Club at Wynn Las Vegas. They enjoyed dinner Cipriani Las Vegas in Wynn Plaza and had a birthday toast with Perrier-Jouët Champagne. Venue performers cheered on Sofia, who wore a red studded bikini and white sheer mini skirt, with a name banner and other signs reading "21."
They then headed to the resort's XS Nightclub, where The Chainsmokers performed. Wearing a pink Swarovski-covered long sleeve Yousef Al-Jasmi jumpsuit, Sofia entered the venue together with Scott. She was greeted by resident performers holding another "Sofia" banner, plus drummers, a confetti parade with a multi-tier birthday cake. The couple danced and were in great spirits. The Chainsmokers' Drew Taggart later had Sofia join him on stage and had the crowd sing her "Happy Birthday." She and her girlfriends were spotted dancing and jumping around onstage, and they also did shots. Scott did not drink throughout the night, a source told E! News.
Wearing a pink latex dress, Kylie arrived later and joined the ladies. At one point, she lifted up Sofia and twirled her around in celebration.
"Kylie was in a great mood, smiling the whole night, while making sure Sofia was having the best time, dancing with her and twirling Sofia around their private VIP area," the source told E! News. "Kylie stayed about 30 minutes before departing early, ahead of the rest of the group."
"Later in the night, Vinny Guadagnino from Jersey Shore showed up and joined in on the celebrations," the source continued. "At one point, Sofia and Vinny faced off in heated dance-off against one another in the DJ booth as The Chainsmokers performed."
Sofia and her group headed back to their private jet around 4 a.m. for the 45-minute journey back to L.A., as seen on Sofia's Instagram Story.
See photos from Sofia Richie's birthday celebration in Vegas:
Sofia is all smiles while Scott Disick plays it cool.
Sofia and boyfriend Scott Disick pose for a couple's pic.
Kylie Jenner takes a selfie before Sofia's birthday bash.
Kylie Jenner gets ready for Sofia's birthday bash.
Sofia gets a shoutout and a birthday song courtesy of The Chainsmokers.
Sofia celebrates at the XS Nightclub at Wynn Las Vegas.
Sofia parties with Jersey Shore's Vinny Guadagnino.
Now that's a birthday cake!
Sofia gets the ultimate birthday greeting at the XS Nightclub at Wynn Las Vegas.
Sofia celebrates at the XS Nightclub at Wynn Las Vegas.
Sofia dances with friends at the XS Nightclub at Wynn Las Vegas.
The birthday girl poses for a birthday portrait at the XS Nightclub at Wynn Las Vegas.
The model takes a dancing break and enjoys some girl time with her friends Victoria Villarroel and Amber Asaly at the Encore Beach Club at Wynn Las Vegas.
The Flip It Like Disick star joins his girlfriend at the Encore Beach Club at Wynn Las Vegas.
Richie dances with her gal pals and Swedish DJ Alesso at her birthday bash at the Encore Beach Club at Wynn Las Vegas.
The birthday girl enjoys a sweet birthday treat.
Sofia goes big for her milestone birthday. She is greeted by a huge crowd that holds a sign with her name on it.
The 21-year-old model celebrates her birthday with a bang at the Encore Beach Club at Wynn Las Vegas.
Celebratory drinks before the real festivities begin!
The Kylie Cosmetics founder is ready to celebrate Richie's milestone birthday.
The 21-year-old model shows off her pretty in pink Chanel outfit, which she pairs with matching blush sunglasses, sneakers and handbag.
The gal pals pose for the cameras at the Wynn Hotel Resort in Las Vegas.
But first... breakfast!
The 21-year-old star prepares herself for a long day full of fun birthday festivities.
Scott Disick showers his girlfriend with a lavish gift that earns him the "best bf award."
Watch Keeping Up With the Kardashians when it returns for season 17 on September 8 at 9/8c only on E!