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March 28, 2015 01:05 AM

Fergie turned 40 on Friday and her husband of six years, Josh Duhamel, took to Twitter with a sweet message for the birthday girl.

“Happy birthday to my girl,” he wrote. “40 never looked so good!!”

The doting hubby, 42, also threw a big birthday bash for his baby mama that featured an old Hollywood glamour theme, a gigantic cake (see below) and a photo booth to document the special occasion.

Fergie – who has a 19-month-old son, Axl, with Duhamel – admitted in an interview with Allure earlier this year that they have worked on their relationship and gone to therapy. They also make sure they spend quality time together.

“My husband and I made a two-week rule,” she said of the maximum amount of time that they’re willing to be apart when she’s on tour. “We’ve already talked about how we’re going to have to trade off. He’s going to have to come on tour with Axl for a while, and then there’ll be a break. He’ll take a job; I’ll be on set with [Axl].

The Battle Creek star wasn’t the only one to offer up birthday greetings.

The Black Eyed Peas also Tweeted best wishes to “the one and only queen,” as did her bandmate apl.de.ap.

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