Jack Brooksbank pictured in Capri with glamorous women as Princess Eugenie ...

For most new fathers, life is an endless grind of dirty nappies and sleepless nights.

But for Princess Eugenie's husband Jack Brooksbank, it's clasping a glass of rosé on a vintage speedboat off the sun-kissed Italian coast while surrounded by bikini-clad models.

And he even gets to call it 'work'.

The 35-year-old is spending the weekend on the chic Mediterranean island of Capri, attending a star-studded charity ball under the stars while his wife remains in Windsor looking after their five-month-old son, August.

Mr Brooksbank is a brand ambassador for Casamigos tequila, a sponsor of last night's invitation-only Unicef Summer Gala, where tickets are priced from £8,000 to £25,000.

And ahead of the bash, he spent Friday afternoon aboard the classic 26ft 'gozzo' boat, exploring the caves and grottos dotted around Capri's coast.

Joining him were Rachel Zalis – a former editor of Glamour magazine who is now Casamigos's global director, and who soaked up the rays in a black bikini – and Maria Buccellati, a model turned fashion ambassador. 

She wrapped her arm around him as they posed for an affectionate-looking Instagram snap to share with her 14,000 followers.

Also on board was Italian model Erica Pelosini, who Jack guided around the boat by placing a hand on her back. 

Though she had a towel wrapped around her at the time, she periodically removed it to go topless in full view of Jack and the boat's skipper. 

During the afternoon-long boat tour, Jack dived into the Tyrrhenian Sea to join his three companions as they bobbed gently in the inviting water.

He could occasionally be seen popping on to the boat deck to look at his phone – perhaps checking-in with Eugenie back at home.