Ben Affleck’s buff at 51! Hollywood star flexes his muscle in tight white tee as he gets back to work after celebrating birthday and first wedding anniversary with Jennifer Lopez

Ben Affleck headed into the office on Tuesday after celebrating both his 51st birthday and his first wedding anniversary with Jennifer Lopez, 54.

The Oscar winner looked fit and fantastic in jeans and a white t-shirt that showed off his toned pecs and arms.

His phone was in his front pocket and he had a black backpack slung over one shoulder. 

The Argo director wore a watch on his left wrist as photographers snapped his photo. 

The father of three is a busy actor, writer and director who is a member of SAG-AFRTA, the WGA and the DGA. Only one of his unions is not on strike currently.

Fit over 50: The Oscar winner looked fit and fantastic in jeans and a white t-shirt that showed off his toned pecs and arms

The Good Will Hunting star wore grey sneakers and looked animated in the snaps.

The new photos come nearly a week after the Gone Girl star turned 51.

JLo celebrated Ben in a sweet video she shared on Instagram. She was sitting in the passenger’s seat of the car that Ben was driving.

‘Dear Ben … Happy Birthday. I love you,’ she captioned the post.

The couple sang along to Sam Cooke’s Wonderful World with the windows of the car rolled down.

They both lip-synced lyrics: ‘Don’t know much about the French I took / But I do know that I love you / And I know that if you love me, too / What a wonderful world this would be.’

And on the day after his birthday, he celebrated one year of marriage with the Marry Me actress.

The Jenny From the Block singer shared never before seen photos from their $400k wedding last year. 

Birthday boy: Ben also recently celebrated his 51st birthday

Anniversary: The day after his birthday, he celebrated one year of marriage to JLo

Pricey purse! On Wednesday, JLo shared a snap of herself wearing an outfit by A.L.C. along with her brown Hermès Birkin bag – created 1984 in honor of the late Jane Birkin – which can cost between $5K-$500K

The two-time Grammy nominee – who boasts 250M Instagram followers – tagged styling duo Mariel Haenn + Rob Zangardi, make-up artist Hrush Achemyan, and nail artist Tom Bachik and captioned her post: ‘Still got me looking like the baddest!’

She also shared a sneak peak at the lyrics for her upcoming song Dear Ben Pt. II.

‘Dear Ben / Sitting here alone / Looking at my ring ring / Feeling overwhelmed / It makes me wanna sing sing / How did we end up here / Without a rewind / Oh my / This is my life.’

Dear Ben Pt. II is one of nine reported songs Jennifer dedicated to her husband on her upcoming 13-track ninth studio album This Is Me… Now, which will be her first record since A.K.A. back in 2014.

The album is considered a follow up to 2002’s This Is Me…Then