As you've probably heard by now, "The Summer of Divorce" has claimed another Hollywood couple.

Gwen Stefani and Gavin Rossdale announced yesterday that they're calling it quits. Although the couple cited irreconcilable differences as the reason for the split, TMZ claims the real reason Gwen chose to end it after almost 13 years of marriage is "because she believed he was cheating on her."

The gossip site did not elaborate on the allegations.

TMZ also claims that Gwen's unhappiness with Gavin's touring schedule contributed to the break up. Gwen allegedly felt Gavin was on the road too much and allegedly put pressure on him to stop touring. That didn't sit well with Rossdale who supposedly felt Stefani was being hypocritical since she was on the road a lot too.

Gavin and Gwen, who have three sons together -- 9-year-old Kingston, 6-year-old Zuma, and 1-year-old Apollo -- are said to be seeking joint custody of their children.

While the custody issue appears settled, financial matters might be a different story. According to TMZ, they did not have a prenuptial agreement. Per California law, that means they are each entitled to half of what their community property is worth.

Gwen is believed to be worth around $80 million, while Gavin's net worth is roughly $35 million. Should their lawyers not be able to work out some sort of financial agreement the pair would split their combined $115 million down the middle, which would mean Rossdale would walk away with 22.5 million more than he has now.