Smile!
Sofia is all smiles while Scott Disick plays it cool.
Dynamic Duo
Sofia and boyfriend Scott Disick pose for a couple's pic.
Hi Kylie
Kylie Jenner takes a selfie before Sofia's birthday bash.
Kylie Gets Ready
Kylie Jenner gets ready for Sofia's birthday bash.
Guest of Honor
Sofia gets a shoutout and a birthday song courtesy of The Chainsmokers.
Time to Party
Sofia celebrates at the XS Nightclub at Wynn Las Vegas.
Hi Vinny
Sofia parties with Jersey Shore's Vinny Guadagnino.
Cake Time!
Now that's a birthday cake!
Happy Birthday
Sofia gets the ultimate birthday greeting at the XS Nightclub at Wynn Las Vegas.
Cheers!
Sofia celebrates at the XS Nightclub at Wynn Las Vegas.
Let's Dance
Sofia dances with friends at the XS Nightclub at Wynn Las Vegas.
Strike a Pose
The birthday girl poses for a birthday portrait at the XS Nightclub at Wynn Las Vegas.
Three's a Party
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.
Scott Disick
The Flip It Like Disick star joins his girlfriend at the Encore Beach Club at Wynn Las Vegas.
Get Your Groove On
Richie dances with her gal pals and Swedish DJ Alesso at her birthday bash at the Encore Beach Club at Wynn Las Vegas.
Mmmm
The birthday girl enjoys a sweet birthday treat.
Feeling Richie
Sofia goes big for her milestone birthday. She is greeted by a huge crowd that holds a sign with her name on it.
It's My Party
The 21-year-old model celebrates her birthday with a bang at the Encore Beach Club at Wynn Las Vegas.
Cheers!
Celebratory drinks before the real festivities begin!
Kylie Jenner
The Kylie Cosmetics founder is ready to celebrate Richie's milestone birthday.
Pretty In Pink
The 21-year-old model shows off her pretty in pink Chanel outfit, which she pairs with matching blush sunglasses, sneakers and handbag.
Strike a Pose
The gal pals pose for the cameras at the Wynn Hotel Resort in Las Vegas.
Breakfast of Champions
But first... breakfast!
Getting Ready
The 21-year-old star prepares herself for a long day full of fun birthday festivities.