Since reality-show stars these days are social-media pros, it is no surprise to see both girls tweeting a picture with Atkins before the event. Magrane tweeted on Monday that it was "fun times."

But someone else was excited to see Atkins: Sen. Rob PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS MORE (R-Ohio) tweeted a picture behind the scenes with the "If You're Going Through Hell" singer on Sunday night.

Other previous "Idol" contestants expected to perform at the GOP convention include Danny Gokey, Taylor Hicks and Ayla Brown.