By Shelby Slaughter At Dailymail.com
Published: 17:22 BST, 1 August 2019 | Updated: 17:22 BST, 1 August 2019
Forty looks good on BJ Novak.
The Office star was surrounded by his costars and other famous friends as he rang in his birthday this week.
The actor took to Instagram on Wednesday to share some photos from his party which had appearances by John Mayer, 41, Bob Saget, 63, his ex-girlfriend and Office costar Mindy Kaling, 40, along with other cast members Jenna Fischer, 45, and Angela Kinsey, 48.
Birthday celebration: BJ Novak was surrounded by his costars and other famous friends as he rang in his 40th birthday
'What a wonderful birthday to celebrate with so many people who make my life what it is – thank you to literally everyone in it for your [heart] in @'s and IRLs. Grateful,' he said along with the photos.
The photos showed some special moments from the celebration including a speech from The Mindy Project star, who sported a blue blazer set for the occasion as she was pictured speaking into the mic.
He even shared a picture of his birthday cake which was just a plain sheet cake that read 'Birthday with no regret.'
Birthday cake: He even shared a picture of his birthday cake which was just a plain sheet cake that read 'Birthday with no regret'
And if all that wasn't enough, John Mayer whipped out his guitar and played some tunes for the party.
The Gravity singer looked casual in a green button up and tan slacks as he performed with a mic and his guitar for the intimate event.
That wasn't the only gift, he was later presented with a mock