02/19/2008 AT 10:40 AM EST
The marriage of pop singer Pink and her husband of two years, motocross racer and former The Surreal Life
star Carey Hart, has ended, the singer's publicist, Michele Schweitzer, tells PEOPLE.
"Pink and Carey Hart have separated. This decision was made by best friends with a huge amount of love and respect for one another," says Schweitzer, adding, "While the marriage is over, their friendship has never been stronger."
Pink, 28, and Hart, 32, met at the 2001 X Games and broke up for a time in 2003, but the split was well behind them in 2005, when the singer popped the question to her beau as he sped around the track during a competition in Mammoth Lakes, Calif.
They married in January 2006
at a non-denominational ceremony in Costa Rica. Among the 100 guests was Lisa Marie Presley.
In August 2007, amid reports that the marriage was on the rocks
, Hart dismissed the stories as "just a bunch of trash talk."