Has Ben Affleck already moved on to another woman?

Ben Affleck is reportedly "ready to move on" from his estranged wife Jennifer Garner.

The 44-year-old actor and the 13 Going on 30 actress officially filed for divorce last week, and sources now claim the Hollywood hunk is making the next steps to start up new relationships.

According to TMZ.com, the Justice League actor is already dating someone new, although the source claims it's "not serious".

An insider told the publication: "He's ready to move on."

The news comes after it was reported last week that both Ben and Jennifer, 45, are still living together as their main focus in their three children, Violet, 11, Seraphina, eight and Samuel, five.

A source said at the time: "They are figuring out what to do about their future living arrangements. For now, they are all living together. One thing they agree on - the kids will stay at the family house.

"Jen and Ben will focus on making things as smoothly as possible for the kids. It's all about what's best for them. The kids went to school as usual, Jen and Ben took turns with drop-off and pick-up. Ben spent alone time with Violet after school. They went for ice cream in Santa Monica."

The two are both requesting joint and legal custody of their children during their divorce proceedings and are "die-hard committed" to raising their brood.

The insider claimed at the time: "They have maintained such a strong and beautiful united front to stay lovely and classy towards each other for their kids. They spend so much time working on their relationship - whether it's a friendship or anything - for their kids ...

"Their friendship is there. They are so die-hard committed to co-parenting. Whatever form this relationship is, they'll always have love for each other, and the love they have for their kids is so strong, they won't let anything bring that down."

Meanwhile, Jennifer Garner’s friends threw her an intimate birthday party over the weekend.

The actress turned 45 on Monday and friends of the brunette beauty organised a small and intimate celebratory bash at Little Beach House in Malibu just the day before she hit the milestone, which saw her and her close pals watch the sunset together.

Speaking about the party to E! News, a source said: "Jen arrived with a small group around 6:30 p.m., just as the sun was starting to set.

"The ladies started out at the bar area, and once everyone arrived, they were moved to tables along the railing overlooking the ocean. The tables looked pretty with little votive candles, hydrangeas and roses."

However, a handful of Jennifer’s pals arrived earlier to help add the finishing touches to the site.

The source continued: "A few of Jen's friends arrived before the party started to get everything set up."

Reese Witherspoon was among the guests who attended the event, as well as Jennifer’s manager and publicist, and the star’s "mum friends".

The insider explained: "Some of the girls were mum friends from school. Her manager and publicist were there as well."

Although Jennifer filed for a divorce from her former partner Ben Affleck last week – almost three years after the couple separated – she is believed to have looked “happy” being surrounded by “people closest to her”.

Speaking about the Texas-born star – who has Violet, 11, Seraphina, eight and Samuel, five, with the dark haired hunk – the source said: “Jen looked so happy to be surrounded by the people closest to her. She had the best evening and was so gracious. She gave a little speech and thanked everyone for coming. Everyone went out of their way to make Jen feel special and be there for her. Her friends adore her and think the world of her."

- Bang! Showbiz