The 25-year-old entertainer wore a reputation Tour t-shirt as she left the concert.
Earlier in the night, Selena joined pal Taylor Swift on stage to perform "Hands To Myself" for the packed crowd.
Later in the night, Taylor and Selena revealed on her Instagram Story that "Hands To Myself" is Taylor's favorite song of Selena's.
Selena was also nominated for Top Dance/Electronic Song for "It Ain't Me" with Kygo at the 2018 Billboard Music Awards tonight (May 20). Unfortunately they already lost out to the The Chainsmokers and Coldplay's "Something Just Like This."