Andrew Watt celebrated his 30th birthday by hosting an all-star jam session with Post Malone, Rob Trujillo, Taylor Hawkins and Chad Smith

Andrew Watt, Post Malone and Rob Trujilio
(Image credit: Andrew Watt/Instagram)

Andrew Watt – production mastermind behind Ozzy Osbourne's latest album, Ordinary Man marked his recent 30th birthday by hosting a star-studded jam session with Post Malone, Metallica's Rob Trujillo, Foo Fighters' Taylor Hawkins, Red Hot Chili Peppers' Chad Smith and Jane's Addiction bassist Chris Chaney.

A series of photos posted to Watt's Instagram page includes one of him and Malone seemingly having a head-to-head shred battle, with both offering their best Hendrix-style behind-the-head playing in front of a number of Orange amps.

Other shots include Rob Trujillo dialing in his tone, and wearing his bass guitar markedly higher than he usually does with thrash titans Metallica.

“DIRTY 30... best jam of all time,” Watt captioned the post.

Though there's no video footage of the jam itself, we're wondering if it included an in-person edition of Watt and Posty's fiery Cliffs of Dover guitar battle. Perhaps some clips are yet to surface...

In the meantime, peruse the photos of the star-studded jam session below.

Me Happy 📸 @davidmushegain WATT (opens in new tab)

A photo posted by @thisiswatt on Oct 24, 2020 at 5:55pm PDT

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Sam Roche

Sam was Staff Writer at from 2019 to 2023, and also created content for Total Guitar, Guitarist and Guitar Player. He has well over 15 years of guitar playing under his belt, as well as a degree in Music Technology (Mixing and Mastering). He's a metalhead through and through, but has a thorough appreciation for all genres of music. In his spare time, Sam creates point-of-view guitar lesson videos on YouTube under the name Sightline Guitar (opens in new tab).