Steven Tyler, 70, channels Jack Sparrow in kooky ensemble as he celebrates girlfriend Aimee Preston's 31st birthday with a gondola ride in Venice

She worked as his assistant for several years before their relationship blossomed into romance. 

And Steven Tyler and his girlfriend Aimee Preston looked as loved-up as ever on Tuesday, as they celebrated her 31st birthday in Venice, Italy

The Aerosmith front man, 70, channeled his inner Jack Sparrow in a kooky ensemble, as he treated his love to a romantic gondola ride for her special occasion.

That's amore: Steven Tyler and his girlfriend Aimee Preston looked as loved-up as ever on Tuesday, as they celebrated her 31st birthday with a gondola ride in Venice, Italy

That's amore: Steven Tyler and his girlfriend Aimee Preston looked as loved-up as ever on Tuesday, as they celebrated her 31st birthday with a gondola ride in Venice, Italy

The rocker did not look far off from the famous pirate character in striped suit trousers, waistcoat and a white shirt, unbuttoned to the navel.

Maintaining the quirky feel from head to toe, Stephen added an array of necklaces and chains, as well as braids in his famously long hair - clearly dressing up for his girlfriend's big day. 

Meanwhile Aimee opted for a stunning Grecian-style maxi dress, which plunged into a saucy V-neckline at the chest, before cascading into soft pleats to the floor.

Quirky: The Aerosmith front man, 70, channeled his inner Jack Sparrow in a waistcoat and shirt, unbuttoned to the navel, as he spent the evening with his glamorous girlfriend

Quirky: The Aerosmith front man, 70, channeled his inner Jack Sparrow in a waistcoat and shirt, unbuttoned to the navel, as he spent the evening with his glamorous girlfriend

Having a ball: The pair celebrated her birthday with a number of friends

Having a ball: The pair celebrated her birthday with a number of friends

Spending the night together for her birthday, the NYC native was seen leading Aimee through the city by the hand, before they embarked on a romantic gondola ride through the city.  

Aimee worked as the rockstar's assistant for several years, before romance blossomed between them.

The pair revealed their relationship at an Oscar viewing party for Elton John’s AIDS Foundation in February 2016, and have been going strong ever since. 

In May, Steven was asked if he'd ever hit on one of daughter Liv's movie star friends, during a game of Spill Your Guts or Fill Your Guts with Late Late Show host James Corden. 

Love is in the air: Aimee worked as Stephen's assistant for years, before romance blossomed between them. They revealed their relationship in February 2016 (pictured in Jan 2018)

Love is in the air: Aimee worked as Stephen's assistant for years, before romance blossomed between them. They revealed their relationship in February 2016 (pictured in Jan 2018)

He admitted with a laugh: 'Yes I have. And I got a lot of s**t for it too.'

He then told how he was seated next to Cameron - who is now married to Benji Madden - in a van on their way out of Stella McCartney's bash and recalled: 'I look at this beautiful woman.

'I said, "Cameron, should you ever need someone to take you to the movies or you know, like, if I was to ask you to show me around London..."'

Stephen shares Liv, 41, with model Bebe Buell, who he enjoyed a brief relationship with in 1977.

He also welcomed daughter Mia with wife Cyrinda Foxe, as well as daughter Chelsea and son Taj with clothing designer Teresa Barrick. 

'I got a lot of s*** for it': Stephen revealed in May that he has previously hit on some of his daughter Liv's friends (pictured in May 2018) 

'I got a lot of s*** for it': Stephen revealed in May that he has previously hit on some of his daughter Liv's friends (pictured in May 2018) 

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Steven Tyler channels Jack Sparrow in Venice with Aimee Preston

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