PICTURE EXCLUSIVE: Look away now Briana! New dad Louis Tomlinson holds hands with girlfriend Danielle Campbell as they celebrate her 21st birthday 

He welcomed his baby boy Freddie Reign ten days ago.

But on Monday Louis Tomlinson enjoyed another important celebration as he treated his girlfriend Danielle Campbell to a night out to celebrate the Disney star's 21st birthday.

The One Direction singer, 24, held hands with the stunning actress as they marked her birthday with an evening in Venice, California.

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Celebrating: New dad Louis Tomlinson  enjoyed a romantic night out with girlfriend Danielle Campbell to celebrate the Disney star's 21st birthday on Monday 

Celebrating: New dad Louis Tomlinson enjoyed a romantic night out with girlfriend Danielle Campbell to celebrate the Disney star's 21st birthday on Monday 

Louis and Danielle looked relaxed in each other's company as they enjoyed some time together less than two weeks after Louis welcomed his son with ex Briana Jungwirth.

Danielle chose a chic red leather jacket layered over a black crop top for her birthday night out, finishing off her ensemble with skinny jeans and heels.

Louis was dressed down in a denim jacket and printed tee as he led the way out of a local restaurant, holding hands with his girlfriend.

See One Direction updates as Louis Tomlinson sees girlfriend Danielle Campbell

I wanna hold your hand: Louis and Danielle looked relaxed in each other's company as they enjoyed some time together less than two weeks after Louis welcomed his son with ex Briana Jungwirth

I wanna hold your hand: Louis and Danielle looked relaxed in each other's company as they enjoyed some time together less than two weeks after Louis welcomed his son with ex Briana Jungwirth

A cluster of pretty pink, purple and blue balloons were tied up outside the celebration spot, as the couple toasted Danielle's milestone birthday.

It seemed to be a double celebration though as 'It's a boy!' balloons were also included. 

It's the first time the couple, who reportedly started dating in November, have been seen together since Louis confirmed he was a dad ten days ago. 

Louis and Briana welcomed their son on Friday January 22, and are said to be helping each other through the early stages of parenthood by living together in rented accommodation in Calabasas. 

With her man: The One Direction singer, 24, held hands with the stunning actress as they marked her birthday with an evening out in Venice, California

With her man: The One Direction singer, 24, held hands with the stunning actress as they marked her birthday with an evening out in Venice, California

Birthday girl: Danielle chose a chic red leather jacket layered over a black crop top for her birthday night out, finishing off her ensemble with skinny jeans and heels

Birthday girl: Danielle chose a chic red leather jacket layered over a black crop top for her birthday night out, finishing off her ensemble with skinny jeans and heels

The exes have been spotted together with their son on a number of occasions since the birth.

A friend of Louis told the MailOnline the former X Factor contestant is planning to be a hands-on dad and support his ex in any way he can.

The pal said: 'Although they're not romantically involved, Louis thinks Briana is a great woman and will be a fabulous mother.

'Louis has been helping Briana financially and is prepared to get stuck in with all the tasks that caring for a baby demands.'  

Feeling tired? Dad of ten days Louis looked a little weary as the couple enjoyed their night out

Feeling tired? Dad of ten days Louis looked a little weary as the couple enjoyed their night out

Low-key style: Louis was dressed down in a denim jacket and printed tee as he led the way out of a local restaurant

Low-key style: Louis was dressed down in a denim jacket and printed tee as he led the way out of a local restaurant

Last Wednesday, the 1D heartthrob took to Twitter to post an adorable first snap of his son.

In a sweet black and white photo, Louis is seen cradling the newborn on his shirtless torso, which he captioned: 'Meet my little lad, Freddie'.

Minutes later he added that the cute baby would be taking his last name, Tomlinson, writing: 'Freddie Tommo'.

Time together: It's the first time the couple, who reportedly started dating in November, have been seen together since Louis confirmed he was a dad ten days ago

Time together: It's the first time the couple, who reportedly started dating in November, have been seen together since Louis confirmed he was a dad ten days ago

Busy month: As well as spending as much time as possible with his baby boy and supporting his ex Briana, Louis is making sure to give some attention to his gorgeous girlfriend

Busy month: As well as spending as much time as possible with his baby boy and supporting his ex Briana, Louis is making sure to give some attention to his gorgeous girlfriend

Keeping close: The couple didn't let go of each other's hands as they left the celebration

Keeping close: The couple didn't let go of each other's hands as they left the celebration

Shortly after, he thanked fans for their well wishes, posting: 'Thank you so much for the all nice messages :)'. 

Danielle has so far not commented on her boyfriend's new father status, instead sharing snaps of her birthday celebrations with her pals over the weekend.

The couple spend the festive period together, with Louis visiting the Disney star and her family in Chicago just before Christmas before Danielle flew to London to party with the Brit star and his pals. 

My boy: Last Wednesday, the 1D heartthrob took to Twitter to post an adorable first snap of his son Freddie

My boy: Last Wednesday, the 1D heartthrob took to Twitter to post an adorable first snap of his son Freddie

Double celebrations: A cluster of pink, purple and blue balloons were tied up outside the restaurant

Double celebrations: A cluster of pink, purple and blue balloons were tied up outside the restaurant

Doting dad: A blue 'It's a boy' balloon was included in the balloon bundle

Doting dad: A blue 'It's a boy' balloon was included in the balloon bundle