The 24-year-old explained that she is after something "really meaningful" like Iglesias's 'Hero' for her first dance with the Wanted star.
"I think it's lovely and the lyrics are really meaningful," she told We Love Pop. "It's just really romantic. I like 'Everything I Do, I Do It For You' too. That's a classic!"
Although she is reluctant to have a track by The Wanted at her nuptials, Keegan insisted that she is a big fan of George's boyband.
"I know every single word to every single Wanted song," she claimed. "[But] Max hates my singing though. He says I'm awful.
"If I hit a good note he'll say, 'That's good', and then he goes, 'But you've ruined it by carrying on'."
Keegan and George became engaged in May 2011 after dating for just seven months.
In January, the couple were forced to defend reports that they had called off their wedding, with Keegan later stating that she was "more in love than ever" with her partner.
Watch The Wanted in the video for 'Lightning' below: