Leonardo DiCaprio presents Mark Ruffalo with the gong at the ...

They starred together in the2010 thriller film Shutter Island.

AndLeonardo DiCaprio decided to honour his former co-starMark Ruffalo with theArtists Inspiration gong at theSAG-AFTRA Foundation's 4th Annual Patron of the Artists Awards at Wallis Annenberg Centre for the Performing Arts in LA on Thursday.

TheOnce Upon a Time In Hollywood star, 44, looked dapper in a black suit, white shrit and striped tie.

Pals:Leonardo DiCaprio decided to honour his former co-star Mark Ruffalo with the Artists Inspiration gong at the SAG-AFTRA Foundation's 4th Annual Patron of the Artists Awards at Wallis Annenberg Centre for the Performing Arts in LA on Thursday

WhileMark,51, looked handsome in a navy suit with a white shirt and lighter blue coloured tie.

Leo was seen on stage delivering a speech before he awarded Mark with theArtists Inspiration award with the two hugging.

The two A-listers starred together in the 2010 thriller film Shutter Island, with Leo playingTeddy Daniels andMark playingChuck Aule.

Leo's attendance comes after he met withGreta Thunberg,calling the 16-year-old 'a leader of our time' and revealing the two campaigners have 'made a commitment to support one another'.

Dapper:The Once Upon a Time In Hollywood star, 44, looked dapper in a black suit, white shrit and striped tie

Award:Leo was seen on stage delivering a speech before he awarded Mark with the Artists Inspiration award

The Oscar winning actor - who has been widely criticised for his use of private jets despite his interest in environmental causes - said it was an 'honour' to speak with the climate activist, posting an image of the two of them together on Friday.

In an Instagram post Leo said he hopes Greta's message is 'a wake up call to world leaders', adding that the schoolgirl makes him 'optimistic about what the future holds'.

In September Leo, who used his acceptance speech at the 2016 Academy Awards to urge lawmakers to 'stop procrastinating' about the issues surrounding climate change, came out in support of Greta at a New York conference.

Sweet: The two A-listers were seen hugging as they reunited at the star-studded event

Co-stars:The two starred together in the 2010 thriller film Shutter Island, with Leo playing Teddy Daniels and Mark playing Chuck Aule

Meanwhile, in his career, after the success of Once Upon A Time In Hollywood, DiCaprio is set to star in The Black Hand.

The Titanic talent has also been cast in Martin Scorsese's next film, period pieceKillers Of The Flower Moon.

Additionally, DiCaprio is also attached to two other Scorsese titles, including a TV series called The Devil In The White City as well as a biopic in which he will portray Theodore Roosevelt.

In his personal life, Leonardo has been datingCamila Morrone,22,since around December 2017, but only appeared to confirm their romance last year with a string of public outings.

His love:In his personal life, Leonardo has been dating Camila Morrone, 22, since around December 2017, but only appeared to confirm their romance last year with a string of public outings