VIDEO : Serena Williams Forced to Back Out of Bridesmaid Duties at Ciara's Wedding?

Getty Images Ciara is officially down one bridesmaid. E! News has learned that Serena Williams was forced to back out of her bridesmaid duties because of her Wimbledon semi-finals match. The happy couple has already started their celebrations in England, stepping out for their rehearsal dinner Tuesday evening with friends such as Kelly Rowland and Lala Vasquez . "Serena really wanted to be part of Ciara's bridal party when she asked her a while back, but she knew work may conflict," a source tells E! News.