The 14-year-old About a Boy star was joined on the red carpet by Legends actor Mason Cook, also 14.
“Headed to .@iheartradio #iheartawards groomed by the awesome @josephadivari!” Ben tweeted before the show.
Meanwhile, Mason wrote, “.@Jeremih I’m sitting with your parents at #iHeartRadioAwards! Heres when u won ur FIRST AWARD EVER! #ManyMoreToCome”
FYI: Mason is wearing head-to-toe John Galliano.