Curb Your Enthusiasm creator Larry David was spotted greeting two-time Oscar winner Sean Penn on the Brentwood set of his hit HBO series on Monday.

The 58-year-old acting veteran lit up a cigarette as he chatted with the 71-year-old comedian, who was directing him in a scene for the 10-episode 10th season.

Sean may have cut his teeth doing comedies like Fast Times at Ridgemont High in 1982, but he normally sticks to ultra-serious, bordering on pretentious fare these days.

Handshake: Curb Your Enthusiasm creator Larry David (R) was spotted greeting two-time Oscar winner Sean Penn (L) on the Brentwood set of his hit HBO series on Monday

The Bob Honey Who Just Do Stuff author was unshaven and sported an unusual brown on top, white on the sides haircut.

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Penn was dressed down in a shearling-collared tan cowboy coat over a grey T-shirt, blue jeans, and grey cowboy boots.

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The El Chapo interviewer warmly greeted two-time Oscar nominee Jonah Hill, who was rocking bleached hair and a Misfits T-shirt as he mingled with the cast and crew on the sidewalk.

Curiously, a big-haired gentleman resembling a young Larry David was clad in a very similar outfit as Sean.

Premiering this fall! The 58-year-old acting veteran lit up a cigarette as he chatted with the 71-year-old comedian, who was directing him in a scene for the 10-episode 10th season

Lighter gig: Sean may have cut his teeth doing comedies like Fast Times at Ridgemont High in 1982, but he normally sticks to ultra-serious, bordering on pretentious fare these days

Lighter gig: Sean may have cut his teeth doing comedies like Fast Times at Ridgemont High in 1982, but he normally sticks to ultra-serious, bordering on pretentious fare these days

Rolled out of bed: The Bob Honey Who Just Do Stuff author was unshaven and sported an unusual brown on top, white on the sides haircut

Twice-divorced father-of-two: Penn was dressed down in a shearling-collared tan cowboy coat over a grey T-shirt, blue jeans, and grey cowboy boots

Just two months ago, the distant cousin of Senator Bernie Sanders had helped Penn raise an impressive $3.5M at his ninth annual Haiti Relief Organization Gala in Los Angeles.

David and his team also did some shooting at Izzy's Deli from 8pm-9pm in Santa Monica, according to eagle-eyed actress Sarah Scheffer, who shared a telling Instagram snap.

On January 30, the Seinfeld co-creator's onscreen best friend Jeff Garlin shared a behind-the-scenes snap of him shooting a scene with the hilarious Susie Essman.

Bring it in! The El Chapo interviewer warmly greeted Jonah Hill

The two-time Oscar nominee was rocking bleached hair and a Misfits T-shirt as he mingled with the cast and crew on the sidewalk

Double take: Curiously, a big-haired gentleman resembling a young Larry David was clad in a very similar outfit as Sean

Chatting: Just two months ago, the distant cousin of Senator Bernie Sanders had helped Penn raise an impressive $3.5M at his ninth annual Haiti Relief Organization Gala in Los Angeles

'Closed for filming': David and his team also shot at Izzy's Deli from 8pm-9pm in Santa Monica, according to eagle-eyed actress Sarah Scheffer, who shared a telling Instagram snap

Production on season 10 began in October, and HBO shared a November 9 teaser of Larry's other onscreen best friend J.B Smoove crashing a scene with David and Garlin.

That same month, the two-time Emmy winner's onscreen ex-wife Cheryl Hines directed him in an episode, apparently involving a litter of Gordon Setter puppies.

Bob Einstein - who played Marty Funkhouser in Curb - passed away January 2 at age 76, but fans can likely catch a final performance from the Emmy winner this season.

'I¿m working': On January 30, the Seinfeld co-creator's onscreen best friend Jeff Garlin shared a behind-the-scenes snap of him shooting a scene with the hilarious Susie Essman (M)

Production on season 10 began in October: HBO shared a November 9 teaser of Larry's other onscreen best friend J.B Smoove (L) crashing a scene with David and Garlin (R)

'I've got my hands full': That same month, the two-time Emmy winner's onscreen ex-wife Cheryl Hines directed him in an episode, apparently involving a litter of Gordon Setter puppies

'We're all in a state of shock': Bob Einstein - who played Marty Funkhouser in Curb - passed away January 2 at age 76, but fans can likely catch a final performance from the Emmy winner this season

'Never have I seen an actor enjoy a role the way Bob did,' Larry - who boasts a $900M fortune - wrote in a statement to Deadline.

'It was an amazing, unforgettable experience knowing and working with him. There was no one like him, as he told us again and again. We’re all in a state of shock.'

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As for Sean, his career has taken a hit with the cancellation of his Hulu series The First, as well as his 2016 flick The Professor and the Madman still having no release date.

Stalled: As for Sean, his career has taken a hit with the cancellation of his Hulu series The First