Adam Levine & John Mayer: Rockers at Howard Stern's Birthday Bash!

Adam Levine salutes the crowd while performing onstage at Howard Stern‘s 60th Birthday Bash held at Hammerstein Ballroom on Friday (January 31) in New York City.

The 34-year-old Maroon 5 singer was not the only entertainer to wow the audience, John Mayer was also on hand to show off his musical talents.

PHOTOS: Check out the latest pics of Adam Levine

Jon Bon Jovi and Train also performed at the bash.

Earlier in the week, John was spotted keeping himself warm while arriving on a flight at JFK Airport.

20+ pictures inside of Adam Levine and John Mayer rocking out at Howard Stern‘s 60th Birthday Bash…