And just like that, he grew up! Frankie Jonas, the youngest of the Jonas brothers, is no longer a little boy. He is a 15-year-old student at Carroll Senior High School in Southlake, Texas and over the weekend Frankie went to prom.
The former child star took his girlfriend Austin to the dance and instead of the awkward prom photos that are usually captured on the night, Frankie and his belle chose to strike some very fun poses.
Frankie took to Instagram to upload the snaps, which showed the young lovebirds "dabbing" – in other words pointing their arms up in the air.
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Frankie Jonas and his girlfriend Austin went to prom
"Dabbing our way through prom," he wrote.
Frankie also sweetly posted a Polaroid snap of his girlfriend planting a kiss on his cheek. "There's no one on earth I'd rather dab with than you," he wrote.
His blonde girlfriend also shared pictures from the night, with her boyfriend and their group of friends.
"There's no one on earth I'd rather dab with than you," wrote Frankie
Frankie clearly put a lot of effort into his prom invite, as he dressed up as Captain America's sidekick Bucky Barnes, while his girlfriend channelled Harley Quinn. Austin held up a sign reading, "I Harley Quinn wait to go to prom with you."
Fans will remember Frankie from his child star days. The actor had a recurring role in Jonas L.A., for which he won the male breakout role at the 2009 Teen Choice Awards. He also made his film debut in Ponyo, where he lent his voice to the animated film.
The youngest Jonas brother with older siblings Kevin, Nick and Joe in 2012
Frankie has also appeared in his eldest brother Kevin's reality TV show Married to Jonas, which followed the lives of the singer and his wife Danielle. Last month the couple announced that they are expecting their second child.
"Prepping for baby number two! #babyjonas2," Kevin, 28, wrote alongside an Instagram photo showing him reading a baby book in bed, while pregnant Danielle lies next to him, surrounded by an assortment of snacks.
The couple, who celebrated their sixth wedding anniversary in December, are already the proud parents of two-year-old daughter Alena Rose.