The model - who married the singer at his beachfront home in Mexico in 2005 - is set to file for divorce at Los Angeles County Superior Court this week, according to gossip website TMZ and Seal appeared to confirm reports when he posted a cryptic tweet saying "The End" on his twitter account.
While he refused to elaborate, a spokesperson for Heidi said a statement is being prepared and will be released imminently.
However, it has also been claimed that although the union of the couple - who have four children together, sons Henry and Johan and daughters Lou and Leni - is in trouble they are "still together - for now".
A source told US Weekly: "Nothing is for sure. Seal has flown back from the UK and he and Heidi are in the house together now.
"They've had a very rough road lately. They're either madly in love or having crazy fights."
The source added their recent trip to the exclusive ski resort of Aspen was full of tension, saying "It was a very hard trip."
The news of the split comes as a surprise as the 'Project Runway' star and the 'Kiss From A Rose' singer have renewed their vows on their anniversary every year in lavish ceremonies surrounded by friends and family.
Hmmm, what's this movie with Josh Hartnett and Rachael Leigh Cook on the cover?...
"Blow Dry" is a leaden British dramedy about an estranged family of hairdressers reconciling when...