Sienna Miller feels ''so good'' after receiving a bear hug from Mark Ruffalo.

The 33-year-old actress - who is engaged to Tom Sturridge - plays the 47-year-old actor's on-screen wife in true crime movie 'Foxcatcher' and revealed he used to give ''a lot of love'' when he embraced his fellow stars.

She said: ''He's a big hugger and you feel so good. Like a bear, man. And he gives a lot of love.''

The blonde actress admitted her 'American Sniper' co-star Bradley Cooper - who was nominated for a Best Actor Oscar yesterday (15.01.15) - is also a big fan of embracing.

When asked if he hugs, she replied: ''Yeah, big time.''

Sienna insists Bradley's performance in the motion picture as sniper Chris Kyle is ''incredible'' but she was grateful to do the motion picture just to meet the shooter's wife Taya Kyle, who she plays in the motion picture.

Speaking on 'The Daily Show', she added: ''I tried to be truthful to the moment. Of course it's a film and it's ultimately about Bradley, who is amazing in this.

''He's incredible but basically everything that happens happened so I could talk to her [Taya], she was very on hand to help me through it and of course you have to up the ante at times.''

The full interview with Sienna airs on 'The Daily Show' on Comedy Central at 1:30am tomorrow morning (17.01.15).