The 28-year-old singer went head-to-head with the 'Strip That Down' singer - who has eight-month-old son Bear with 34-year-old partner Cheryl Tweedy - on this week's episode of 'Drop the Mic' and made a number of jibes at Liam's expense, starting with branding him the least popular member of One Direction.
He said: ''Look, everybody! It's the guy from 1D. Not the pretty one, not the gritty one - it's the one you never see.
''Your biggest win is havin' an older woman. But holla at ya boy when you sell a hunnid million.
''Those are some numbers that actually pay. And your first single sounds like one of my throw-aways.''
Liam, 24, hit back at the insult about his girlfriend, adding in a quip about Jason's mom in retaliation.
He rapped: ''Yes, my girlfriend is older, ya ain't wrong. Older women love me, especially your mom.
''Making fun of One Direction, Jason, that's lazy. I got that one D that'll make a lady crazy.
''You're attacking the things that I did as a kid. Made a song called 'Get Ugly,' then you actually did.
''You here to take me out? Well, I wish you good luck. You finally answer the question: 'What if D'Angelo sucked?'''
The 'Talk Dirty' hitmaker went on to mock Liam's penchant for shirtless selfies, insisting the images made his opponent look like a ''clown'' - and he also slipped in his own mom joke.
He rhymed: ''And you take shirtless selfies like you a clown. But I'm the only one that should be strippin' it down.
''This boy right here, he's not worthy to me. But at least I get to tell his mom to talk dirty to me.''
And Jason couldn't resist striking a blow over Bear's unusual name.
He said: ''Your son is Bear Payne, yeah that's cool, I'm sure that will go well with the kids in high school.''
At the end of the rap battle, hosts Method Man and Hailey Baldwin declared Liam the winner.
From their newest EP 'What Did You Think When You Made Me This Way', Nothing But Thieves drop the lyric video for their single 'Take This Lonely...
The Lumineers honour their friend and hero Tom Petty with a sensational cover of his 1996 song 'Walls' from the 'She's the One' soundtrack.
Watch Olly Murs get his nerd on as he blags his way into an exclusive Snoop Dogg party (where Rowan Atkinson is the bartender) in the video for their...
From 'Happy' to 'Banana Pancakes', these are soaked in positivity.
Mariah Carey is the picture of glamour in the black and white video for her brand new single 'With You'. It's the lead single from her forthcoming...
Eminem draws attention to the negative response his 2017 album 'Revival' received in the video for his latest song 'Venom'; a song recorded for the...
With the recent release of her third, very well received album 'Hunter' just behind her, Anna had plenty of relatively new songs to showcase.