Pair said to have had a series of rows

Sienna Miller and Rhys Ifans are believed to be cooling off their relationship.

The pair are said to have had a series of rows because she is struggling with the idea of getting hitched.

‘He’s sensed that she isn’t quite ready to settle down and has been getting quite jealous and possessive,’ a source tells the Daily Star.

‘Sienna only accepted Rhys’s proposal on the third time of asking because she really loves him and didn’t want to lose him, despite feeling a bit unready for marriage.’

It is also rumoured Sienna was upset over snaps of her ex Jude Law, 35, kissing Kimberly Stewart, 28, last week.

The actress, 26, is now in a black mood.

Her blonde hair has been dyed dark for new movie G.I. Joe.

She is also reported to have put on a stone in muscle for her role as The Baroness.

See Sienna Miller’s black hairdo here>>