Bearded Mel Gibson cuts a bizarre figure as he strolls bare-chested on set of his latest film... after surprising fans on hike in Ireland

He has recently been seen enjoying a romantic stroll with his pregnant girlfriend Rosalind Ross, 26.  

But Mel Gibson was back on set on Wednesday, filming his latest movie The Professor and the Madman in Dublin.

The 60-year-old actor looked rather bizarre as he strolled through the set baring his chest under a black coat teamed with jeans.  

Bare chested: Mel Gibson bared his chest as he strolled through the Dublin set of his latest film The Professor and the Madman on Tuesday

Bare chested: Mel Gibson bared his chest as he strolled through the Dublin set of his latest film The Professor and the Madman on Tuesday

The Professor and the Madman co-stars Sean Penn and is about the creation of the Oxford English Dictionary. 

The film is adapted from a book by Simon Winchester focusing on the creation of the Oxford English Dictionary, and Gibson will play the professor of the title, Sir James Murray. 

According to Variety, Penn stars as Dr William Chester Minor, - a man who who submitted more than 10,000 entries for the dictionary while he was an inmate at an asylum.

Surprise! Three hikers came across Mel on the summit of Wicklow Mountain at the weekend 

Surprise! Three hikers came across Mel on the summit of Wicklow Mountain at the weekend 

Revision time: Mel seemed to be reading from his script in the Irish holiday 

Revision time: Mel seemed to be reading from his script in the Irish holiday 

Eclectic appearance: Mel was later seen in period dress with a script in hand 

Eclectic appearance: Mel was later seen in period dress with a script in hand 

His appearance came after he surprised several fans on the summit of Wicklow Mountain last weekend. 

Fans Heather Fogarty and her pals Michael O’Connor and Shane Gallagher bumped into the star during their hike in Ireland.  

'Climbed the sugar loaf today,' Heather wrote, alongside the snapshot on Instagram. 'And to top it all off, we met Mel Gibson at the summit.'  

New role: Mel plays professor James Murray, who began compiling the dictionary back in 1857,

New role: Mel plays professor James Murray, who began compiling the dictionary back in 1857,

Back to work: Mel is also producing The Professor and the Madman

Back to work: Mel is also producing The Professor and the Madman

The star looked in relaxed mood on set after the recent announcement that he would become a father for the ninth time. 

And Mel was recently seen enjoying a healthy lunch date with his pregnant girlfriend.

Rosalind Ross - who is 34 years his junior - is a writer and former equestrian vaulter and a decade younger than his eldest child. 

Relaxed: It was recently announced that Mel would become a father for the ninth time 

Relaxed: It was recently announced that Mel would become a father for the ninth time 

Gibson has seven children with ex-wife Robyn Moore: Hannah, 36, twin boys Christian and Edward, 34, William, 31, Louis, 28, Milo, 26, and Thomas, 17.

He also has a six-year-old daughter, Lucia, with former girlfriend Oksana Grigorieva.

'Mel and Rose are so excited about the baby,' a friend told People magazine.

'Mel loves being a dad and he and Rose can't wait to be parents together. The last two years have been some of his happiest years he's ever had.' 

Soon-to-be dad: Mel Gibson stepped out in Dublin recently with his pregnant girlfriend Rosalind Ross, 26, for a healthy lunch date

Soon-to-be dad: Mel Gibson stepped out in Dublin recently with his pregnant girlfriend Rosalind Ross, 26, for a healthy lunch date

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