Jennifer Lopez is all smiles as she celebrates her 51st birthday with family at the beach

She rang in her 51st birthday over the weekend.

And Jennifer Lopez  enjoyed an idyllic celebration on Friday as she watched the sunset in the Hamptons with fiance Alex Rodriguez, 45, and their blended family. 

The now 51-year-old pop star flaunted her famous physique in a pair of skintight cosmic leggings and a knit lilac sweater. 

Lopez sported a dark purple sports bra under her cozy sweater and she had a pair of white trainers on her feet.

Her golden tresses were tied back into a low ponytail and she donned a pair of highly reflective sunglasses. 

Jennifer and her crew were armed with face masks in order to adhere to coronavirus guidelines as they celebrated on the beach. 

She had her cellphone in her hand and a smile on her face as she and her birthday crew explored the seemingly desolate beach. 

Rodriguez was clearly feeling the ocean breeze as he bundled up with a navy blue hooded sweatshirt and a pair of black board shorts. 

The former MLB player – who turned 45 on Monday, July 27 – sat next to Lopez in the sand, while his daughters Natasha, 15, and Ella, 12 and Lopez’s 12-year-old fraternal twins, Emme and Max, played in the ocean.

Jennifer shares Emme and Max with her ex husband Marc Anthony, 51, while Alex shares his two daughters with ex wife Cynthia Scurtis, 47.

The family had a professional photographer with them and they stopped numerous times to pose all together for portraits with the ocean as their backdrop. 

Jennifer and Alex had a hard time wrangling their children for the group shots.

Once they finished their photo session, Jennifer, Alex, and their family fled the sand and hit up a nearby ice cream truck. 

She held onto her daughter Emme’s hand as Alex’s daughter Natasha walked beside them with a pair of shorts in her hand. 

The On The Floor singer showed off her fresh light pink manicure as she waved a half eaten corn dog in the air that she had purchased from a nearby food truck.

Without letting go of her tasty snack, Jennifer helped lift her son Max into the bed of their family’s blue jeep.

At this point, Jennifer had on her blue bicycle helmet, which meant the singer had plans to bike back to their family’s Hamptons abode.  

Alex penned a sweet message to Jennifer on Friday, where he referred to her as ‘the greatest partner’ and that ‘every moment with [her] is magical.’

Rodriguez shared several throwback images of the Hustlers actress, both older and more recent. 

‘Happy Birthday, Macha!!! Every moment with you is magical. You are the greatest partner, the best mom, the most amazing performer. A role model. A hero. An inspiration,’ read the former pro-athlete’s caption.

On Sunday evening, Jennifer returned the favor by posting a touching tribute to Alex on her personal Instagram page.

‘You are on TV right now and I’m sitting here in the studio watching you and thinking about how I only want to be right here with you…laughing and joking and enjoying life together… whatever that is, wherever that is…doesn’t matter. That’s the blessing I have in you… happy birthday 13,’ concluded Lopez.

She shared some adorable throwback photos of the birthday boy, including some photos of him in Little League. 

Alex proposed to Jennifer in March of 2019, after dating for nearly two-years.