‘Happy’ Jennifer Lopez celebrates 55th birthday at low-key East Hampton dinner with friends — but no Ben Affleck

After her “Bridgerton”-themed blowout bash, Jennifer Lopez had a low-key dinner with friends in the Hamptons on her 55th birthday, spies tell Page Six exclusively.

Lopez was spotted at power haunt Nick & Toni’s in East Hampton on Wednesday night dining with pals — but not her husband, Ben Affleck.

A source says that the “Atlas” star was “celebrating her birthday with no Ben in sight.”

The insider adds that Lopez dined “with five people” and “when she walked in, the entire packed room went silent and stared” at the glamorous star.

Jennifer Lopez back in NYC after summer in the Hamptons as Ben Affleck remains in LA

Later, as she left just after 11 p.m., she “greeted fans and took a photo with two young girls,” according to the source, who shares, “She was polite and nice with the staff.”

The insider notes that “the owners seemed to know J.Lo was coming, and they slipped her in the back door to avoid the paparazzi out front.”

We hear that “several guests made warm toasts to the birthday girl” at the intimate dinner.

“She looked happy,” our source says. “But she wasn’t dancing on the table; they were not raucous.”

Another insider tells us, “She arrived in a custom Jeep Wrangler with tunes blasting, donning a cream sequined dress.”

Jennifer Lopez’s 55th birthday style is fit for a queen

The insider adds that Lopez was with “her mother [Guadalupe Rodríguez], manager [Benny Medina] and friends.”

“The entire room sang ‘Happy Birthday’ when her tiered pale green cake was brought to the table,” they say.

Meanwhile, “In just the other room, Alec Baldwin and his wife [Hilaria Baldwin] dined a few tables away from Michael J. Fox and his wife [Tracy Pollan].”

The “Hustlers” star had already celebrated with a larger, over-the-top birthday party days earlier.

Her “Bridgerton” bash included flowing frocks, ballroom dancers, a live orchestra and a surprise performance, per a clip Lopez shared on Instagram earlier Wednesday.

“Dearest Gentle Reader … And a splendid evening was had by all,” she captioned the video of the party.

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For her birthday, which is July 24, she posted a clip of herself singing a duet with her vocal coach, Stevie Mackey , that “happy days are here again.”

“Here’s to a new and HAPPY year around the sun,” J.Lo captioned the post. “Late birthday nights with [Mackey].”

Lopez had previously posted a birthday message to her fans that read, “It’s hard to believe we have spent all this time together. … I still feel like the same girl starting out so full of energy and bravado, so ready to take on the whole world on the outside.”

She added that “on the inside,” she feels “tender, fragile and sometimes frightened.”

The emotional post — which featured photos of herself standing in front of her cake in blue silk pajamas and a birthday crown — comes two months into the ongoing speculation that Lopez and Affleck’s marriage is on the rocks .

A rep for the singer did not immediately comment.

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