The six-year marriage of Hollywood stars Ashton Kutcher and Demi Moore may be coming to an end and the couple's silence on the matter over the past few months has added to the rumors.

Their once active Twitter accounts, which used to be full of notes about their happily-married life, have been quiet for some time.

The rumor is that Kutcher's affair with Sara Leal, a woman he met Saturday at the Hard Rock Hotel in San Diego, could be the cause of the split.

The couple was married in 2005, in Beverly Hills, after a two-year romance.

See the photos below for a reminder of their happier moments.

Ashton Kutcher and Demi Moore
Demi Moore and her husband Ashton Kutcher arrive at the "The Joneses" film screening during the 34th Toronto International Film Festival, September 13, 2009. The festival runs from September 10-19. Reuters
Ashton Kutcher and Demi Moore
Actors Demi Moore and her husband Ashton Kutcher watch the New York Yankees play the Los Angeles Angels in their MLB American League baseball game at Yankee Stadium in New York April 15, 2010. Reuters
Ashton Kutcher and Demi Moore
Actor Ashton Kutcher and wife Demi Moore stand at the sidelines before the NFL's Super Bowl XLIV football game between the New Orleans Saints and the Indianapolis Colts in Miami, Florida February 7, 2010. Reuters
Ashton Kutcher and Demi Moore
Actors Ashton Kutcher and Demi Moore arrive for GQ magazine's "Gentleman's Ball" in New York October 28, 2009. Reuters
Ashton Kutcher and Demi Moore
U.S. actors Ashton Kutcher (L) and Demi Moore react during an interview in a shopping centre in Pasching some 180 kilometres (about 112 miles) west of Vienna October 29, 2010. Kutcher and Moore visit Austria on occasion of a charity tour. Reuters
Ashton Kutcher and Demi Moore
Actress Demi Moore brushes her husband, Ashton Kutcher's hair, prior to a news conference at the United Nations Headquarters in New York, November 4, 2010. Kutcher and Moore are kicking off the launch of the UN Voluntary Trust Fund for Victims of Trafficking in Persons. The Trust Fund will provide humanitarian, legal and financial aid to victims of trafficking and will be administered by the UN Office on Drugs and Crime. Reuters
Ashton Kutcher and Demi Moore
Actress Demi Moore smiles (L) next to her husband, actor Ashton Kutcher, before the beginning of the Stop Human Trafficking Now forum in Luxor, southern Egypt, December 11, 2010. Reuters
Ashton Kutcher and Demi Moore
Actor Ashton Kutcher and his wife actress Demi Moore (R) arrive for Colcci's Winter 2011 collection during Sao Paulo Fashion Week January 30 2011. Reuters
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