New York, Apr 16 : Sienna Miller ended up giving photographers more than she intended when she had a bikini malfunction when she went surfing at a Malibu beach with boyfriend Rhys Ifans.

The blonde actress was frolicking in Santa Monica, CA, with Ifans, to whom she is rumoured to be engaged, but she left the people there gob-smacked when her skimpy top slipped down, exposing her twin assets.

However, the actress took the bikini-malfunction, so to say, quite coolly as she pulled up the top before retreating to the sand with a female friend.

Sienna is no stranger to skin-show, as it was just last year that she filmed nude scenes for her upcoming movie 'Hippie Hippie Shake'.

According to Britain's Daily Mail, after her not so embarrassing scene at the beach, the 26-year-old star of 'Camille' and 'Layer Cake' met up with actor boyfriend Rhys Ifans for sushi at Nobu in Malibu.

The pair may soon take the wedding vows, reports New York Daily News.

ANI