The 33-year-old star and fellow actor Tom, 29, have apparently called time on their relationship, just weeks after enjoying a sun-kissed break to Ibiza with their three year old, Marlowe.
Tom and Sienna became engaged in 2012, giving birth to baby Marlowe just six months after they announced their marriage plans.
But now a source has told The Sun newspaper that things are over for the acting duo, telling them: ‘Tom and Sienna Split a few weeks ago but still love and respect each other as friends and parents. It’s a very amicable break-up and they intend to remain great friends.’
Rumours swirled that Sienna was no longer engaged after she appeared without her ring at the Cannes Film Festival two months ago, but no official confirmation was made.
Sienna has dated several showbiz characters over the years, most notably Jude Law - who she dated for three years between 2003 and 2006, before reigniting the flame in 2009 for two years.
In the same year that her relationship disintegrated with Jude, Sienna took up with actor Tom Sturridge, who she said in 2013 was the ‘perfect balance to my lunacy.’
There has been no official comment from either party at this time.