Gym Class Heroes frontman Travis McCoy has sparked rumours he is to marry rocker girlfriend KATY PERRY after presenting her with a diamond "promise ring".

The Cupid's Chokehold star admits he wanted something special to give to Perry and spent more than $300 (GBP150) on the piece of jewellery.

He tells People.com, "I went in (to the jewellery store) and said I wanted a ring. The lady behind the counter said 'here's one for $300.' I was like, 'I want a nice ring!' Then I pointed to the big one."

But he remained coy when asked if it was an engagement ring, saying, "It's a promise ring... and I have one too!"