Jason Derulo 'cheated' on Jordin Sparks with a model… watch her awkward response here!

Singer-actress Jordin Sparks has opened up about her messy split with Jason Derulo amid claims he cheated on her with a model.

Watch the clip above to see Jordin's totally awkward response when talk show host Wendy Williams asked if her boyfriend of three years was unfaithful. Yikes!

Model Carmen Ortega has come forward with claims she dated 'Talk Dirty' singer Jason while he was still with Jordin.

"We dated for a month," Carmen told Star Magazine. "We went out in public with friends a few times, so I assumed he didn't have a girlfriend."

The 30-year-old says she "cut ties with him immediately" when she discovered he was already taken.

"He tried telling me their relationship was strictly fuelled by management teams," she said. "He lied to me the entire time."

Note: This is the same model who in 2009 claimed she had an affair with Reggie Bush while he was dating Kim Kardashian.

But regardless of Carmen's latest claims, Jason insisted to Us Weekly that the split with Jordin was amicable."'Infidelity, cheating or deceit played no part in our relationship or our break-up," he said.

What makes this whole situation even more uncomfortable is that Jason wrote his hit 'Marry Me' about Jordin… and she even appeared in the music video.

"It is about Jordin, actually,' he told E! News. "'And it's talking about how amazing it will be when I get down on one knee and it will be the greatest moment of my life." Awkward!

Watch more clips of couples who broke up after recording music clips together in our slideshow.

View slideshow: Totes awks! Couples who made a music video together then broke up…