Bella Thorne's boyfriend Tristan Klier is a football player, and he just kicked off the high school season.

Bella was there to support her guy, and she had a cute surprise in store for him – a homemade sign! It says “I'm With #9”.

She also cheered him on via Twitter, tweeting “I would like to wish @TristanKlier89, @CameronKlier48, & @Kswanson469 a GREAT 1^st day and 1^st football game of the season!”

Tristan tweeted good news after the game: “Victory over Oaks Christian!” along with this photo of the couple.

It looks like Tristan was really happy to have his girlfriend there to support him. 

Source: Just Jared Jr.