Celebrities, pro athletes, and olympians ring in 2015 Special Olympics

President Barack Obama and First Lady Michelle Obama are ringing in the start of the 2015 Special Olympics in Los Angeles, but they're definitely not the only ones taking part in the ceremonies. Celebrities from different walks of life—some former professional athletes, others entertainers, and even former Olympians—are all gathering to see the participants give it their all.

Can't believe I did this. Why not I guess!?! Haha #Belieber

A photo posted by Amanda (@amandafreed7) on Jul 25, 2015 at 6:20pm PDT

Un orgullo compartir con Dikembe Mutombo y unirnos en la misma causa - Apoyar las #SpecialOlympics #LosAngeles2015 pic.twitter.com/bqMpvvXUp8

— Bobby Abreu (@BobKellyAbreu) July 26, 2015

Hanging w/ @MichaelPhelps @LA2015 - we're so excited to be walking with our @SpecialOlympics athletes! pic.twitter.com/1EHysP7YDA

— Michelle Kwan (@MichelleWKwan) July 26, 2015

.@WWETheBigShow joins @TimShriver and @SpecialOlympics athlete Ronnie at the #LA2015 Opening Ceremonies! #ReachUpWWE pic.twitter.com/HRVypNzIdo

— WWE Community (@WWECommunity) July 26, 2015

My buddy @CodySimpson and I are ready for @SpecialOlympics @LA2015 #SpecialOlympics pic.twitter.com/F3nqPpCMY1

— Lauren Potter (@TheLaurenPotter) July 26, 2015

Back with @MichelleWKwan for Opening Ceremonies of the Special Olympics Worlds. @greglouganis pic.twitter.com/zKDX3YNPBn

— Gregory Louganis (@greglouganis) July 25, 2015

So proud of our athletes at the @SpecialOlympics! You’re bringing us together and filling us with hope. USA! -mo pic.twitter.com/zWSTpkRLlg

— The First Lady (@FLOTUS) July 26, 2015