Mel Gibson, 68, looks unrecognizable at Vince Vaughn's Hollywood Walk of Fame ceremony in LA

Mel Gibson looked unrecognizable at Vince Vaughn's Hollywood Walk of Fame ceremony in Los Angeles on Monday.

The 68-year-old veteran actor was seen with gray hair and a scruffy beard for the event.

Gibson - who is best known for his Lethal Weapon franchise - also was much more dressed down than other attendees.

He had on a white collared shirt and long ombre blue shorts that went to his knees. For added comfort, the Mad Max star wore black lace-up sneakers.

Most of the time the father of nine children had black mirrored sunglasses on that made him difficult to recognize.

Vince, 54 - who will be starring in the series Bad Monkey that debuts this week - wore a dark suit and white shirt as he posed with his wife Kyla and their two children.

Mel Gibson looked unrecognizable at Vince Vaughn's Hollywood Walk of Fame ceremony in Los Angeles on Monday

The veteran actor was seen with gray hair, a scruffy beard and prescription glasses hanging from his top

Mel and Vince costarred in the 2018 thriller Dragged Across Concrete.

Gibson posed with Vaughn by his new Walk Of Fame star and at one point opened his brown cell phone case to take a selfie; his driver's license photo could be seen as well as his Visa card.

Gibson - born Mel Columcille Gerard Gibson - was born in New York by moved to Australia at age 12.

He is known for his action hero roles, particularly his breakout role as Max Rockatansky in the first three films of the post-apocalyptic action series Mad Max.

And he is also popular for playing Martin Riggs in the buddy cop action-comedy film series Lethal Weapon.

One of his biggest standouts is 1995's Braveheart. He also won raves for his 2004 movie The Passion Of Christ.

Monday was all about Vince as he will soon debut his new high-profile series. 

Vaughn's new Apple TV+ show Bad Monkey kicks off on Wednesday.

The first trailer for the series, which also stars Michelle Monaghan and John Ortiz, debuted earlier this month.

The actor opened his cell phone case to take a selfie; his driver's license photo could be seen 

Gibson - who is best known for his Lethal Weapon franchise - also was much more dressed down than other attendees

He had on a white collared shirt and long ombre blue shorts that went to his knee. For added comfort, the Mad Max star wore black lace-up sneakers. Most of the time the father of nine children had black sunglasses on that made him difficult to recognize

Vince, who will be starring in the new series Bad Monkey, wore a dark shirt and white shirt

Vaughn - who used to date Jennifer Aniston - had his family was with him on Monday. He married Kyla Weber in 2010

Together they have two children: daughter Locklyn, 13, and son Vernon, 11

Vince looked thinner for his new role as talkative cop Andrew Yancy.

The show was created by Bill Lawrence. 

He is the creator of the series Scrubs and co-creator of shows including the live-action Cougar Town, Spin City, Ground Floor, Ted Lasso, and Shrinking.

'After getting bounced from the Miami PD, a former detective is demoted to restaurant inspector in the Florida Keys,' read the synopsis.

'An unusual new case might get him back in the department if he can get past a trove of oddballs, and one bad monkey,' it also said.

Vince's next project in his new Apple TV+ detective series, Bad Monkey

His costar is Meredith Hagner as bad girl Eve Stripling

Vaughn - who used to date Jennifer Aniston - had his family was with him on Monday.

He married Kyla Weber in 2010 and together they have two children: daughter Locklyn, 13, and son Vernon, 11. 

They are not often pictured in public. 

Vaughn may also be starring in a sequel to one of his earlier hits soon.

The Swingers actor dated his The Breakup costar Jennifer Aniston in 2006