Jennifer Lopez was clutching her cell phone as she headed to the gym in Miami Beach following her Montana getaway with ‘on again’ Ben Affleck.

The 51-year-old superstar was on her way to a personal training session at Anatomy Fitness on Thursday morning.

JLo is reportedly ‘happy’ with Ben after the couple ‘rekindled their romance’ following her split with fiance Alex Rodriguez.

Getting in a workout: Jennifer Lopez headed to the gym in Miami Beach following her Montana getaway with Ben Affleck

The mother to twins Max and Emme was wearing a baggy cropped aqua sweater with a rounded collar and long textured silver leggings that clung to her sculpted figure.

Underneath her sweater, the Hustlers star wore a gray sports bra.

The cropped style of the sweater showed off the stunning Jenny From The Block singer’s toned torso and flat abs.

Stylish: She was wearing a baggy cropped aqua sweater with a rounded collar and long textured silver leggings that clung to her sculpted figure

The brunette beauty’s golden highlighted hair was pulled back from her face into a low topknot.

She accessorized with a pair of large gold hoop earrings and oversized gold-rimmed sunglasses with translucent black lenses.

The Wedding Planner actress was also rocking Kooples x Slick Woods sneakers in black with black straps and white soles. Designed by a supermodel, the sneakers are clearly a favorite of Jennifer’s since she has been seen wearing them in several different colors.

Out of the way: The brunette beauty’s golden highlighted hair was pulled back from her face into a low topknot

Underneath her sweater, she wore a gray sports bra. The cropped style of the sweater showed off the stunning singer’s toned torso and flat abs

Nice kicks: The Wedding Planner actress was also rocking Kooples x Slick Woods sneakers in black with black straps and white soles. Designed by a supermodel, the sneakers are clearly a favorite of Jennifer’s since she has been seen wearing them in several different colors

Lopez carried a smoothie cup, her phone and her wallet as she strolled into the building. She went maskless and appeared to be wearing minimal makeup.

This comes as Jennifer and Ben have reportedly reconciled. They have been spending time together over the last few weeks following the end of her engagement to Rodriguez, 45, and last weekend, the pair were spotted in Montana, where the 48-year-old actor has a holiday home.

A source told People magazine of their break: ‘She had a great time with Ben. She is happy with him and enjoys spending time with him.’

The hitmaker and the Argo star – who were pictured in a car together near a resort in Big Sky – are said to have a ‘strong connection’ with one another.

Great chemistry: The hitmaker and the Argo star – who were pictured in a car together near a resort in Big Sky – are said to have a ‘strong connection’ with one another. Seen in 2003

Rediscovering their love: Though JLo and Ben ended their engagement in 2004, they are reportedly rekindling their romance and recently took a trip together. A source told People magazine of their break: ‘She had a great time with Ben. She is happy with him and enjoys spending time with him.’ Seen in 2003

Another source said: ‘[Jennifer] spent several days with Ben out of town. They have a strong connection. It’s all been quick and intense, but Jennifer is happy.’

The Maid In Manhattan actress got engaged to her Gigli co-star in 2002 and they were due to marry in 2003 but postponed the ceremony just days before it was due to take place and officially split in January 2004.

It was recently claimed they have maintained a friendship since their romance fizzled out the first time round.

A source said recently: ‘They have spent time together in LA over the past week. They have a lot of love for each other. They have always admired each other.’

Over: Jennifer and her fiance Alex Rodriguez insisted they were working through their issues but last month they confirmed they had gone their separate ways. Seen in 2020

The singer-and-actress – who has 13-year-old twins Max and Emme with ex-husband Marc Anthony, 52, – was rumoured to have split with the retired baseball star in March.

However, Jennifer and father-of-two Alex insisted at the time they were working through their issues but last month they confirmed they had gone their separate ways.

In a joint statement, they said: ‘We have realized we are better as friends and look forward to remaining so. We will continue to work together and support each other on our shared businesses and projects. we wish the best for each other and each other’s children.’