Sammy Hagar received one spicy surprise during his Hollywood Walk of Fame ceremony this week … ’cause his ‘Red Hot’ buddy Chad Smith showed his love in person.

Sources with direct knowledge tell TMZ … Smith — the longtime drummer for the Red Hot Chili Peppers — came to Hagar’s ceremony as a surprise guest Tuesday, and totally shocked the Van Halen frontman.

We’re told Sammy went to hug his longtime bandmate, bassist Michael Anthony … when he realized CS was sitting right beside him.

Smith popped up to hug Sammy … before joking Hagar really screwed the Red Hot Chili Peppers — ’cause Guy Fieri‘s seat was sitting right on top of his own band’s star on the boulevard.

The duo later caught up while taking pics with John Mayer and Mike … a little band reunion of sorts — ’cause Hagar, Smith and Anthony actually played in the band Chickenfoot together in the late 2000s.

As for post-ceremony … our sources say Sammy went to grab a bite with a small group of friends and family members at The Polo Lounge at The Beverly Hills Hotel — which gifted him a giant chocolate guitar.

Just check out the pics … pretty impressive display, we gotta say — complete with a ton of tributes to SH’s decades-long career from solo artist to Van Halen and a whole lot more.

Getty

Seems like a day Hagar will never forget … and, one he got to experience with some famous friends.