Adam Brody thinks Suri Cruise is "so cool".

The 30-year-old actor - who stars alongside Katie Holmes in 'The Romantics', a romantic comedy about seven college friends who reunite six years later for a wedding - admits he is quite taken with his co-star's three-year-old girl, whose dad is Hollywood superstar Tom Cruise.

He said: "Her daughter's down-to-earth. You would think her daughter would not be. Her daughter's so cool, I can't believe it actually.

"I don't mean to talk about a three-year-old as if she's down-to-earth or not, you know what I mean? I'm just saying she's very outgoing and fun."

The former 'O.C.' star - who dated Rachel Bilson for three years - also denied rumours he was romancing 'Glee' beauty Dianna Agron.

When asked whether the claims were true, he simply replied "no".

'The Romantics' - which also stars Anna Paquin and Josh Duhamel - is set for release later this year.