BRITNEY SPEARS went berserk when she heard that her ex-husband Kevin Federline married his baby mama Victo­ria Prince in a top secret ceremony at a Las Vegas hotel suite, a family insider told The ENQUIRER.

“When Britney was told the news, she screamed uncontrollably,” re­vealed an insider.

“Then she collapsed in tears. The wedding caught her by surprise. She wasn’t invited and she didn’t even get a call from Kevin to let her know he was marrying Victoria.

“Britney had to hear about it from one of K-Fed’s friends after the ceremony was over.

“It was hard for Britney because she’s long suffered from the delusion that she and Kevin would one day get back together and raise their two boys (Sean, 7, and Jayden, 6).”

Britney’s divorce from Kevin was finalized back in 2007, but she never abandoned her fantasy re­union, even after she got engaged to her agent Jason Trawick in December 2011, said the insider.

Since they split, Britney has been dating 27-year-old David Lucado, a former bartender and insurance agent who now works for a Los Ange­les legal firm.

But Britney’s new romance apparently didn’t soften the blow of Federline’s Aug. 10 marriage, even though the bride and groom first met nearly five years ago and have a 2-year-old daughter, Jordan.

“Even after Jordan was born, Britney held onto her fantasy of rec­onciliation with Kevin,” said the insider. “But the wedding has crushed her, and she’s angry that she definitely won’t be getting Kevin back.”

Britney also finds it hard to ac­cept that the couple is essentially raising her boys.

“Sean and Jayden even call Victoria ‘Mommy,’ and it sets Britney blazing with anger,” said the source. “She’s called them up screaming about it.”

Under conditions of her court-or­dered conservatorship, the troubled singer is allowed to have only part time visitation with her sons and only when a bodyguard or nanny is present.

K-Fed, 35, and Victoria, 30, were married in a private ceremony in the plush Paradise Tower Penthouse of Las Vegas’ Hard Rock Hotel.

Dressed in a beautiful white wed­ding dress, Victoria looked radiant as she read her own vows in front of a minister.

Former backup dancer Kevin also looked dashing. He’s dropped about 50 pounds and looks much like he did when he became engaged to Britney in 2004, and the source said: “That’s just another source of jealousy for her!”