WATCH: Jennifer Lopez goes for a birthday bike ride in the Hamptons with no sign of Ben Affleck…

Jennifer Lopez kicked off her 55th birthday with a leisurely bike ride with her 16-year-old son, Max, in the Hamptons on Wednesday. As she rang in the milestone without her estranged husband, Ben Affleck, who did not attend her extravagant Bridgerton-themed bash, the superstar enjoyed some quality time with her teenager, who she shares with ex Marc Anthony.

The pair biked over to Pierre’s French restaurant, where they were joined by one of her friends, who wore a pink and silver ‘Happy Birthday’ headband. For the occasion, the Grammy nominee looked elegant in a $3,400 white and aqua mid-length shirtdress, which she belted, from Dior and a pair of studded flats.

The mother-of-two wore her light brown locks in a sleek ponytail and accessorized with a pair of oversized sunglasses, a straw tote bag, and statement earrings. Her massive green diamond engagement ring remained on her left finger, despite rumors of martials woes after spending her second wedding anniversary apart from the two-time Oscar winner.

Meanwhile, Max wore an all-white ensemble and brown sandals. The mother-son duo dined outside the French bistro, located in the heart of Bridgehampton, before heading home on their bikes. The intimate celebration was much quieter than the lavish party she threw in her own honor, which included a horse-drawn carriage and period-era costumes.

Guests were seen arriving to her home in elaborate garments, inspired by Netflix’s hit show Bridgerton, over the weekend. People confirmed that Affleck was ‘not in attendance’ at the party, which took place on Saturday. On Wednesday, J-Lo shared a video featuring footage from the bash, which included Regency-era dances and, at least, two wardrobe changes from the birthday girl.

Lopez looked like the diamond of the season in the video montage, which showed her singing into a microphone, blowing out her candles and enjoying orchestral music.