British musician Miles Kane has questioned his ex-girlfriend Suki Waterhouse's reported new romance with Hollywood hunk Bradley Cooper because of the large age gap between the pair.

The Hangover star, 38, has fuelled speculation he is dating the 21-year-old British beauty after the pair was spotted enjoying several dates in recent weeks.

It is the actor's first romance since splitting from Zoe Saldana before Christmas (25Dec12), while Waterhouse dated Kane for a year.

The Rascals rocker insists he wishes his ex nothing but the best, but admits he's slightly concerned about the age gap between Waterhouse and her reported new beau.

He tells Britain's The Sun, "The thing is, she is a 21-year-old girl and you forget how young she is. I don't know how old he is - what, 40 or something like that? She is a young girl and I'm sure he'll realise that.

"Good luck to them. I'm on great form. I've got a new album coming and lots of gigs, so I won't be dwelling on it all."