Rob Lowe rings in his milestone 60th birthday with Katy Perry, Robert Downey Jr., Cameron Diaz, and more at extravagant Santa Barbara bash

Rob Lowe celebrated his 60th birthday with a star-studded soirée in Santa Barbara on Saturday while clad in a sleek black pinstripe suit. 

The Floor producer-host – who technically hit the milestone on March 17 – hired a live band featuring Grammy-winning jazz saxophonist Kenny G to entertain the crowd until 1:30am. 

Rob invited family and A-list friends such as American Idol judge Katy Perry and her fiancé Orlando Bloom.

The 47-year-old Red Right Hand action star – who popped the question to the 39-year-old pop star in 2019 – was dressed down in a black jacket over a matching sweater, grey slacks, and Doc Marten-style boots. 

Newly-minted Oscar winner Robert Downey Jr. arrived wearing sunglasses and an all-grey suit.

The 58-year-old Oppenheimer actor was joined, as always, by his second wife and producing partner, Susan Levin Downey. 

Four-time Golden Globe nominee Cameron Diaz – who’s in the midst of a Hollywood comeback – clutched a branch of flowers alongside her husband Benji Madden, with whom she just welcomed her second child (son Cardinal) via surrogate.

Lowe’s youngest son John Owen Lowe Instastoried a snap of the large sign greeting guests at the bash reading: ‘No posting of any photos on any social media.’

The 28-year-old Unstable creator-star wore an all-black suit as he chatted with two lovely ladies. 

Lowe’s party was also attended by Zoe Saldaña, Amy Poehler, Kevin Costner, Jennifer Aniston, Gwyneth Paltrow and husband Brad Falchuck, Ellen DeGeneres and wife Portia de Rossi, Adam Levine and wife Behati Prinsloo, Chris Pratt and wife Katherine Schwarzenegger, Christopher Schwarzenegger, and Maria Shriver.

The Brat Packer hired a live band featuring Grammy-winning jazz saxophonist Kenny G to entertain the crowd until 1:30am.