It's fair to say that 19-year-old gymnastics sensation Simone Biles has had a pretty good Olympics.

By winning her fourth gold in Rio - and fifth medal of the games - Biles became the most decorated gymnast in American history. If you've been paying attention to the Texan athlete's social media accounts during the Olympics, you'll know that when she hasn't been preoccupied with obliterating the competition in her sport, she's been making friends with celebrity crush Zac Efron. Looking at the back and forth tweets between the two, it's difficult to tell who's fangirling harder. Efron has been hugely vocal in his support of the US Gymnastics team, which hasn't gone unnoticed by the medal-hoarding teenager. And when we say she's an admirer of Zac Efron, we mean she's really an admirer of Zac Efron. https://twitter.com/Simone_Biles/status/522165873898172416?ref_src=twsrc%5Etfw https://twitter.com/Simone_Biles/status/554419655360540672?ref_src=twsrc%5Etfw https://twitter.com/Simone_Biles/status/608810480535076864?ref_src=twsrc%5Etfw https://twitter.com/Simone_Biles/status/569657052118716416?ref_src=twsrc%5Etfw So after Biles picked up gold number four in the women's floor exercise, Efron decided it was time he met his new hero, and the gymnast's reaction to the surprise proved that while she may be an unstoppable Olympic powerhouse, she's just like any other teenager in the presence of a Hollywood heartthrob. https://twitter.com/USAGym/status/765661798527799298?ref_src=twsrc%5Etfw

Biles naturally documented the whole thing on Twitter.

https://twitter.com/Simone_Biles/status/765666552410759168?ref_src=twsrc%5Etfw https://twitter.com/Simone_Biles/status/765664680215969793?ref_src=twsrc%5Etfw https://twitter.com/Simone_Biles/status/765665961953419264?ref_src=twsrc%5Etfw https://twitter.com/Simone_Biles/status/765670542288519168 https://twitter.com/jordynsleftbrow/status/765661993030287361

And as for Efron, well, he knew he'd just met a superstar.

https://twitter.com/ZacEfron/status/765722207678898176