The wedding between Usher and his pregnant fiancee has been canceled, his publicist told The Associated Press on Saturday.

However, a statement released by publicist Patti Webster exclusively to the AP read: "It was announced today that the wedding ceremony for Usher Raymond, IV and Tameka Foster was canceled. No additional information will be given regarding the circumstances of the cancellation, but we hope the privacy of this matter will be respected."

"Usher's mother [and former manager, Jonetta Patton, whom he fired in May] is against the wedding. That is one of the main obstacles," according to the source, who also said of the bride, 37, and groom, 28: "They only decided two weeks ago to have a wedding. They wanted to have it take place before the baby bump started showing."

But as another source tells PEOPLE: "Usher changed his mind."

Usher (full name: Usher Raymond) and Foster, a stylist, also "had a lot of differences about the details. For example, the bride wanted barbeque, [and] he wanted to have [renowned chef] Jean Georges cook," said the source.

As a result of the differences, the wedding "was on again off again for the past few days. [Foster] was calling it off because she wasn't getting the things that she wanted. The mother was calling it off. ... Usher was calling it off." [READ MORE]

Labels: Tameka Foster, Usher