Rumer Willis has reportedly split from her actor boyfriend Micah Alberti.

The 'Sorority Row' actress - the daughter of Bruce Willis and Demi Moore - is said to be devastated after the pair decided their two-year relationship "wasn't working".

The separation was supposedly very sudden and left the 22-year-old star inconsolable.

The couple first went public with their relationship at the premiere of her movie 'The House Bunny' in 2008 and had appeared as a fixture on the Hollywood scene ever since.

A source told People: "They decided it wasn't working. They're moving on."

While a friend of the duo added to Life and Style magazine: "She is very upset.

"She went to Las Vegas this past weekend with a few friends to try to cheer up and have fun, but she's very sensitive about the break-up."

Rumer was spotted partying last weekend at top nightspot Tao in Las Vegas with 'Glee' star Mark Salling and his actor friend Chord Overstreet in a bid to get over Micah.

And at one point, the pretty brunette and Chord flirted on the dancefloor.

An onlooker added to People: "Rumer was bouncing around the club having a great time just dancing. Chord was flirtatious with Rumer. They had a lot of fun."

US soap star Micah - who starred in hit shows 'All My Children' and 'One Life To Live' - appeared to have been accepted by Rumer's family, often appearing with his girlfriend and her mother Demi and her stepfather Ashton Kutcher on the red carpet at movie premieres.