Entertainment Music Megan Fox Joins Boyfriend Machine Gun Kelly on Stage During His Indy 500 Performance Megan Fox and Machine Gun Kelly made their latest public appearance together at Barstool Sports' party during the Indy 500 weekend By Eric Todisco Published on May 31, 2021 10:38 AM Share Tweet Pin Email Photo: Michael Hickey/Getty Images Machine Gun Kelly and Megan Fox stole the show at the Indy 500 this past weekend. On Friday, the Transformers actress, 35, joined her rocker boyfriend, 31, on the stage during Kelly's performance at Barstool Sports' party at Grand Park in Westfield, Indiana. Fox wore a black crop top, blue jeans and black heels as she proudly stood by her boyfriend's side. Kelly opted for a tight black shirt and stylish pants as he sang several songs, including "I Think I'm Okay" for the crowd. According to E! News, Fox came out after the crowd chanted "Megan" for some time. Megan Fox and Machine Gun Kelly. Michael Hickey/Getty Images Megan Fox and Machine Gun Kelly. Michael Hickey/Getty Images Machine Gun Kelly and Megan Fox Get Dressed Up to Celebrate Her 35th Birthday Kelly and Fox have been going strong since they were first spotted out together in May 2020. The pair initially met on the set of their forthcoming movie, Midnight in the Switchgrass. "Megan is very happy," a source recently told PEOPLE. "They got serious quickly and have a great relationship." Last week, Kelly shared on Twitter that the day marked the one-year anniversary of the first time Fox said "I love you" to him. "She said 'i love you' one year ago today," Kelly — whose real name is Colson Baker — tweeted. RELATED VIDEO: Machine Gun Kelly's First Dates with Megan Fox Included Scaling a Building, Swimming with Sharks In an interview with NYLON last November, Fox called her relationship with the musician a "once in a lifetime thing." Sharing that they have a connection of "mythic proportions," the actress added that "loving him is like being in love with a tsunami or a forest fire." Never miss a story — sign up for PEOPLE's free weekly newsletter to get the biggest news of the week delivered to your inbox every Friday. The cool couple have even taken the next step in their relationship as Kelly has spent more time with Fox's kids. The Jennifer's Body actress shares three sons with estranged husband Brian Austin Green: Noah, 8, Bodhi, 7, and Journey, 4. "Colson is getting to know her kids," a source previously told PEOPLE. "Megan loves her boys, and they will always be her priority. She is excited that they have accepted Colson."