Rock lovebirds Gwen Stefani and Gavin Rossdale are saying “I do” — times two!

And in true rock girl style, Gwen — the stunning blonde lead singer of No Doubt — partied hearty at her bachelorette bash.

The 32-year-old sexpot wed Rossdale — lead singer of the Brit band Bush — at St. Paul’s Church in London on September 14 in the first half of the pair’s transatlantic nuptials.

The two will redo their “I dos” in a second wedding ceremony on September 28 at the TinselTown home of music producer Jimmy Iovine.

“Gwen and Gavin decided to have ceremonies on both sides of the ocean to accommodate all their friends and family members,” said a source close to the couple.

They told pals, “This way we get to double our wedding pleasure — and no one’s left out!”

The party started when Gwen’s girl posse threw her a wild bachelorette bash.

“Gwen said the party was so much fun she barely made it to a bridal shower that her sister and sister-in-law threw for her at noon the next day,” the source revealed.

“Gwen said the gang ‘drank till we were sick!'”

As her father Dennis walked her down the aisle, Gwen glowed in a fabulous floor-length frock and elegant embroidered veil by designer John Galliano.

The gown’s bodice was the traditional white. But in a dramatic touch, its skirt was tinged with rose.

“Gwen looked gorgeous!” said the source.

“The groom and his Bush band mates wore matching dark suits with roses in their lapels.

“Even Gavin’s dog Winston, a Hungarian puli, was decked out in a collar made of roses.”

Wedding guests included the singer Seal and Gwen’s former beau, her No Doubt band mate Tony Kanal.

Now pals say the crooning twosome are set to start a family.

“Gwen wants to have a baby right away,” the source revealed.

“She says, ‘I’m 32 and I think about babies a lot.'”