'It's incredible!' Louis Tomlinson opens up about fatherhood as he makes his debut on America's Got Talent.. after his ex lashes out at his new love on Twitter

Last week his ex Briana Jungwirth appeared to lash out at his girlfriend Danielle Campbell on Twitter. 

But Louis Tomlinson put any stress in his personal life to one side as he made his debut as a guest judge on Wednesday. 

The 24-year-old One Direction star, who is father to six-month-old Freddie Reign, charmed his fellow panel and onlookers as he opened up about his personal life.

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Natural: Louis Tomlinson put any stress in his personal life to one side as he made his debut as a guest judge on Wednesday

Speaking to Mel B as they took a break from filming, he revealed to the mother-of-three how much he was enjoying fatherhood.

When asked whether he was working on new music he replied: 'I've just had a baby boy, a son, so that's taken all my time.

'I didn't think I'd be having a kid at this age, but it is incredible,' the British singer gushed. 

Mel B responded: 'How old are you?', to which Louis replied, '24'. 

See more America's Got Talent updates as Louis Tomlinson opens up about fatherhood

Gushing: The 24-year-old One Direction star, who is father to six-month-old Freddie Reign, charmed his fellow panel and onlookers as he opened up about his personal life

Daddy duties: Speaking to Mel B as they took a break from filming, he revealed to the mother-of-three how much he was enjoying fatherhood

And Louis, who was briefly signed to play football on a non-contract basis for his hometown team Doncaster Rovers in 2013, also revealed he would be happy for little Freddie to follow in his footsteps. 

'If he wants to, of course. I could coach him! 

'He can do whatever he wants to do. He can try sport and if that doesn't work, do music!'

Louis relocated to LA after finding out Briana, who he had a brief relationship with, was expecting their child. 

And the Perfect hitmaker is regularly seen doing his fatherly duties, as well as posting snaps of his adorable son Freddie to his Instagram account.  

Happy: 'I didn't think I'd be having a kid at this age, but it is incredible,' the British singer gushed

Mini me: Louis, who was briefly signed to play football on a non-contract basis for his hometown team Doncaster Rovers in 2013, also revealed he would be happy for little Freddie to follow in his footsteps

However ex Briana appeared to lash out on Instagram last week, after pictures emerged of Louis, Danielle and Freddie enjoying a day at the beach.

Briana, 23, wrote: 'You can pretend all you want but you will NEVER be my baby son's mother.'

The tweet appeared on the account @realbjungwirth, which, although not verified, has almost 30,000 followers and is linked to Briana's Instagram account, where she often shares pictures of Freddie. 

The Twitter account is also followed by Briana's mother Tammi and her cousin Ashley.

Not happy? Ex Briana appeared to lash out on Instagram last week, after pictures emerged of Louis, Danielle and Freddie enjoying a day at the beach

New flame: Louis with girlfriend Danielle Campbell who he has been dating since last year

After facing a barrage of criticism on social media, the mother of Louis Tomlinson's baby son Freddie hit back with a lengthy statement at the start of the month.

Briana took to the micro-blogging site to plea with those who she says have been making 'hateful' comments about her and her son. 

She wrote: 'To all those who feel the need to make disparaging, hateful and inappropriate comments concerning me and my son Freddie - I am sincerely sorry that you all have chosen to focus your time and attention on my life and the life of my son.

'Surely you must have better things to do than pry into the personal life of a single mom and newborn child.

Chilling with judge Simon Cowell: Louis relocated to LA after finding out Briana, who he had a brief relationship with, was expecting their child

Judging panel: The regular panel consists of regulars Simon, Mel B, Heidi Klum and Howie Mandel.

'I am a proud new mother that is extremely joyous about my child being in this world and have shared that joy with my friends and family on a daily basis - often times through social media.

'However, that does not give anyone the right, or an invitation to be nasty and disparaging towards me. So, please stop prying into the private and personal facts of my life and my son's life in order to weave stories and peak public interest. (sic)'

Briana's message comes just weeks after it was claimed that her and Louis' custody battle over Freddie was sparked by her jealousy over Danielle, who Louis started dating last year.

Speaking previously, a source close to the mother of one - who gave birth to her child in January this year - said: 'Before Briana got pregnant, she was bragging to friends about how serious she was with Louis. She thought it was going to be a real relationship.

Battle: Briana's message comes just weeks after it was claimed that her and Louis' custody battle over Freddie was sparked by her jealousy over Danielle

'I've just had a baby boy, a son, so that's taken all my time' he told Mel B earlier

'When Louis started dating Danielle, Briana was upset and that's when the drama started. Briana really tried to make the relationship work, and she became jealous when he moved on.

'When she was pregnant he was very supportive and paying for all her medical needs. He bought her a house, but she wanted something bigger.'

The posts come after reports state that Louis is reportedly seeking joint custody of son Freddie with ex-girlfriend Brianna Jungwirth.

And TMZ reports that Louis is said to have started the proceedings over claims Brianna is keeping his son away because she doesn't want him around his new girlfriend, Danielle Campbell.

A representative for Louis declined to comment when contacted by MailOnline. 

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