This Is 54!

A HAPPIER-THAN-EVER JENNIFER LOPEZ USHERED IN HER LATEST BIRTHDAY WITH A PARTY FOR THE AGES — AND A RENEWED SENSE OF EXCITEMENT FOR WHAT THE FUTURE HOLDS.

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LET’S get loud! In honor of her 54th birthday, on July 24, Jennifer Lopez’s husband, Ben Affleck, threw the star an epic bash at the couple’s new $60 million Beverly Hills mansion. “All the kids were there,” the birthday girl later wrote of the couple’s blended brood in her On The JLo newsletter. “It was a gorgeous day full of sunshine and perfect for a pool party.” And some boogying. In a clip from the festivities, Jennifer — wearing a slinky, backless silver gown — can be seen dancing on a table to Lizzo’s “About Damn Time.” Says a source: “She had the best time. She was treated like a queen and loved every second.”

It’s shaping up to be Jennifer’s best decade yet. She and Ben, 50, celebrated the one-year anniversary of their Las Vegas wedding shortly before her birthday and she’s set to release her ninth studio album, This Is Me… Now, this summer. The mom to twins Emme and Max, 15, with ex Marc Anthony, is also settling in as stepmom to Ben’s kids, Violet, 17, Seraphina, 14, and Samuel, 11, with his former wife,