London, April 26 (ANI): Sugababes star Keisha Buchanan reportedly fumed after her beau-of-18 months failed to prove on a TV show that he knew much about the singer.

The Brit singer was said to have seen red after her appearance with boyfriend Dean Thomas took a tumble on the Mr And Mrs, which tests couples’ knowledge of one another.

“It was absolutely humiliating for them both - Keisha was fuming about some of Dean’s answers,” News of the World quoted a quiz show insider as saying.

“On one question, he was asked who the best kisser was . . . Dean replied that he was,” the insider added.

Some alleged questions were:

What is Keisha’s favourite band?

Keisha - The Sugababes, of course.

Dean - Er, Girls Aloud?

Who is the hottest Sugababe?

Keisha - I hope he says me!

Dean - Is that ginger one still there?

Name the Sugababe Line-Up

Keisha - Heidi, Amelle and Keisha.

Dean - Dopey, Sneezy & Bashful? (ANI)