David Harbour is his girlfriend’s number one fan as he dons an old Lily Allen t-shirt

David Harbour is his girlfriend’s number one fan as he dons an old Lily Allen t-shirt in cute snap from their Croatia getaway

He’s been enjoying a sun-soaked break in Croatia with Lily Allen and her daughters Ethel, eight, and Marnie, seven.

And David Harbour was his girlfriend’s number one fan on Thursday as he donned one of the singer’s tour t-shirts.

The actor, 45, slipped into the black merchandise which had Lily’s name on the front in a green speech bubble.

Rock on: David Harbour was his girlfriend’s number one fan on Thursday as he donned one of Lily Allen’s tour t-shirts

The Stranger Things star had a stern expression for the snap taken during their break in the popular resort of Hvar.

Lily, 35, captioned the post: ‘@dkharbour in eBay bootlegged merch.’  

The couple have been making the most of their getaway to the Adriatic coast as they enjoy some family time together.

Getaway: The couple have been making the most of their getaway to the Adriatic coast as they enjoy some family time together

Getaway: The couple have been making the most of their getaway to the Adriatic coast as they enjoy some family time together

Wow! Lily showed off her sensational figure in a plunging leopard-print bikini as she soaked up the sun with her two daughters and beau David on Wednesday

Wow! Lily showed off her sensational figure in a plunging leopard-print bikini as she soaked up the sun with her two daughters and beau David on Wednesday

It comes after Lily looked sensational as she soaked up the sun with her loved ones while on a yacht during their trip in a slew of snaps shared via Instagram on Wednesday.

The singer was sure to set pulses racing in her leopard-print bikini that had a plunging neckline to show off a glimpse of her cleavage.

Lily accessorised her stylish swimwear by wearing a colourful beaded necklace as well as a silver chain to give her look a glittering touch.

Her raven tresses were pulled back into a messy bun, and she used a light palette of make-up to accentuate her natural beauty.

Relaxing on the boat, Lily shared a video where she posed up a storm while also showing off her slender figure before she joked in the caption of one snap : ‘i tried’. 

Attention to detail: Lily accessorised her stylish swimwear by wearing a colourful beaded necklace as well as a silver chain to give her look a glittering touch

Stylish: Her raven tresses were pulled back into a messy bun, and she used a light palette of make-up to accentuate her natural beauty

Attention to detail: Lily accessorised her stylish swimwear by wearing a colourful beaded necklace as well as a silver chain to give her look a glittering touch

Family: Lily has been on cloud nine as she soaked up the sun on the island of Lastovo, Croatia, alongside her loved ones

Family: Lily has been on cloud nine as she soaked up the sun on the island of Lastovo, Croatia, alongside her loved ones

Lily’s outing comes after she celebrated one year of sobriety. 

The star has previously been open about her struggle with alcohol and substance abuse, saying she turned to it when she experienced trouble in her personal life.  

To mark the past 12 months of being tee-total, Lily posted bikini photos alongside one of the star looking noticeably worse-for-wear. Lily captioned the post: ‘1 year completely sober! So grateful for my health and happiness.’ 

It is thought Lily gave up drinking around the time she started dating her Stranger Things boyfriend David Harbour, 45.

Candid: Lily's outing comes after she celebrated one year of sobriety and the star previously spoke candidly about her struggle with alcohol and substance abuse

Candid: Lily’s outing comes after she celebrated one year of sobriety and the star previously spoke candidly about her struggle with alcohol and substance abuse

The couple were first spotted at the theatre in London last August and their relationship has gone on from strength-to-strength. The mother-of-two previously took to Instagram to laud her new healthier lifestyle after she quit drinking. 

She told her fans: ‘9 months sober today! And the beginning of an ab is appearing. Very pleased!’ 

Lily revealed she had turned to the bottle when experiencing trouble in her personal life in an interview with Stereogum in 2018.

Lily, who has bi-polar disorder, said: ‘I think I’m a raging co-dependent and then when I feel like I can’t cope, I abuse alcohol and drugs to plaster over some stuff, but I’ve never been somebody that craves a fix.’ 

The singer also previously discussed her year of turmoil in 2013, taking place just months after she gave birth to her second child. 

Loved-up: It is thought Lily gave up drinking around the time she started dating her Stranger Things boyfriend (pictured together in February)

Loved-up: It is thought Lily gave up drinking around the time she started dating her Stranger Things boyfriend (pictured together in February)