Lifestyle Style Happy Birthday, Justin Bieber! Here's How Other Stars Celebrated Their 21st in Style The pop star celebrated shirtless. See how he compares to these other stars' celebration outfits By Alex Apatoff Alex Apatoff Instagram Twitter Alex Apatoff is the Executive Editor of PEOPLE Digital. She has been with the brand for more than a decade, holding various roles on the Style and Beauty team before becoming the site's Lifestyle Director to coordinate the work across the commerce, evergreen, features and marketing teams. Prior to her role at PEOPLE, Alex worked at Us Weekly (where, among other things, she oversaw the Fashion Police pages) and graduated from Northwestern University with a Bachelors in Journalism. People Editorial Guidelines Published on March 2, 2015 09:00 PM Share Tweet Pin Email Trending Videos 01 of 09 JUSTIN BIEBER Courtesy Hailey Baldwin spent his 21st birthday on a private island, surrounded by friends, ladies he’s rumored to be dating (this is Hailey Baldwin and Yovanna Ventura was there too) and Champagne (his first taste, we assume). He also wore lots of hats and very few shirts. 02 of 09 SELENA GOMEZ bruja/Juan Sharma/Pacific Coast News ex toasted her transition into legal ID-hood in a streamlined look of short shorts and a crop top, which she called really cute and appropriate for my 21st. 03 of 09 ARIANA GRANDE Disney/Splash News Online Popping bottles? Dancing on tables? Not for this former Disney star, who put on a pair of mouse ears and a polka-dot skirt to hang out with Cinderella for her 21st. 04 of 09 ASHLEE SIMPSON Arlene Richie/JPI In heavy eyeliner, a black mini and red patent heels, there’s no part of the at 21 that resembles the boho-chic newly married expectant mom anymore. 05 of 09 MILEY CYRUS Courtesy Miley Cyrus Some stars (and some mere mortals) get all dressed up to hit the clubs for their 21st. Others (like ) strip down to nothing and post about it on Twitter. 06 of 09 LINDSAY LOHAN Kevin Mazur/Wireimage Not many among us want to invite our moms to our 21st birthday bash, let alone have matching hair and outfits to her. But that’s why we’re not the . 07 of 09 KEKE PALMER Pacific Coast News It was supposedly a surprise birthday bash, but the star’s “athleisure” look is so cute, we have to assume she had some idea her friends were planning something. 08 of 09 RUMER WILLIS Denise Truscello/Wireimage What, you didn’t spend your 21st at Tao Las Vegas, surrounded by Bruce Willis, Demi Moore and Ashton Kutcher? Elvis didn’t sing “Happy Birthday” to you? Well, you probably wore a sparkly dress, so you’re at least one for three. 09 of 09 ROBERT KARDASHIAN Denise Truscello/Wireimage Another celeb who got a five-star bash in Las Vegas: the Kardashians’ little bro, who shuns the spotlight now, but then toasted his 21st in a Yankees hat and buttoned-up short-sleeve Oxford.