She's smitten with Brothers And Sisters star

It’s hard keeping up with Sienna Miller’s lovelife.

After being linked to newly single P Diddy, 37, and then actor Sean Bean, 48, the actress is now reported to be dating Matthew Ryhs.

Sienna, 25, and Matthew, 32, were introduced by Keira Knightley back in May and are said to have kept their romance under wraps since then.

But now Sienna’s telling pals she’s smitten with the Brothers And Sisters star.

‘This is the first bloke Sienna has been serious with since she finally split with Jude,’ a source tells The Sun.

And friends deny she’s been getting dirty with P Diddy.

‘These vicious allegations of her being with Diddy and splitting up his relationship with Kim Porter are awful,’ the pal says.

‘Sienna and Diddy are party pals. They love to go out and have a good time but that’s where it ends…’