Kourtney Kardashian shows off her toned figure... after John Mayer accuses the single mom of spreading false romance rumours

Kourtney Kardashian showed off her stunning image in a social media snap shared on Wednesday.

The 40-year-old single mother-of-three was in a bra top and leggings with her face turned away.

This comes after musician John Mayer - who has dated Jessica Simpson, Jennifer Aniston and Katy Perry - accused the Keeping Up With The Kardashians beauty of spreading the rumour that he wanted to date her.

Still hot stuff: Kourtney Kardashian showed off her stunning image in a social media snap shared on Wednesday. The 40-year-old single mother-of-three was in a bra top and leggings with her face turned away

Still hot stuff: Kourtney Kardashian showed off her stunning image in a social media snap shared on Wednesday. The 40-year-old single mother-of-three was in a bra top and leggings with her face turned away

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Kourtney had her eyes closed and her arms over her makeup-free face as she rested on a black yoga mat inside a gym with free weights by her side.

The college graduate had on a beige bra top that was semi see through and managed to show off plenty of her tummy.

The Poosh founder added printed high-waisted leggings.

Pure: Kourtney had her eyes closed and her arms over her makeup-free face as she rested on a black yoga mat inside a gym with free weights by her side

Pure: Kourtney had her eyes closed and her arms over her makeup-free face as she rested on a black yoga mat inside a gym with free weights by her side

The brand wasn't just any brand: it was her sister Khloe's Good American line. It is not known if Kourtney was posing in the grab for a payment or just doing it to help her sister.

The Dash Dolls vet was makeup free and had her black hair pulled back.

She also wore black sneakers with white soles that were likely made by Kim's husband Kanye West.

Inside job: John Mayer seemed to suggest the Kardashians were behind rumors that he and eldest sister Kourtney were dating during a stop by Andy Cohen's radio show on Monday
Fiction: After denying the fling, the Gravity singer, 41, seemed to suggest the origin of the rumor was none other than the reality TV happy family itself

Inside job: John Mayer seemed to suggest the Kardashians were behind rumors that he and eldest sister Kourtney were dating during a stop by Andy Cohen's radio show on Monday

This comes after famous lothario Mayer tried to set the record straight during a visit to his best friend Andy Cohen's SiriusXM studio on Monday. 

He denied having a fling with Kourtney.

And then the Gravity singer, 41, seemed to suggest the origin of the rumor was none other than the reality TV happy family itself.

Hinting at how the Kardashians may have been behind it all, John told Andy: 'Little suspicious about the origin of the story…not sure the call’s not coming from inside the house on this one.'

He continued, commending the rumor-starters for their devious yet ingenious strategy.

'If the call is coming from inside the house…it’s diabolical and genius,' John said, 'Because when people start gossiping about you and someone else, and they start putting your pictures together, it gets real suggestive.'

He explained some of the reasons he was peeved by the gossip, telling Andy: 'The only part that made me upset, to any degree, was that somebody said that when I saw Kourtney, that I said "It was sweet serendipity running into you."'

The line was even too 'corny' for the singer, who continued: 'Which I would never say! But if you're getting paid to write the stories... If you listen to every John Mayer song and say "What's the next thing he might say based off all the lyrics you just read... It might be [that].'

Suspicious minds: Hinting at how the Kardashians may have been behind it all, John told Andy: 'Little suspicious about the origin of the story…not sure the call’s not coming from inside the house on this one'

Suspicious minds: Hinting at how the Kardashians may have been behind it all, John told Andy: 'Little suspicious about the origin of the story…not sure the call’s not coming from inside the house on this one'

Kourtney and John were first linked back in December after they were seen 'flirting' at the GQ Men Of The Year party. 

An eyewitness said Mayer 'seemed very into' Kardashian and noted that he said crossing paths with her was 'sweet serendipity.'

'He seemed very into her,' an eyewitness told the publication.

Mayer was heard telling the sister of Kim and Khloe that crossing paths was 'sweet serendipity' and they should 'meet up again soon.'

Back then an 'insider' confirmed he was 'crushing hard.'

They had a thing: It seems that Mayer may have proposed to Katy Perry; seen in 2013

They had a thing: It seems that Mayer may have proposed to Katy Perry; seen in 2013

They were an item: Mayer was with Jennifer Aniston for over a year; seen here in 2009
And he was in love with this lady: And earlier he was with Jessica Simpson; seen here in 2005

He likes famous women: He dated Jennifer Aniston, left, in 2009, and he was with Jessica Simpson, right, in 2005

Baby daddy: Kardashian and father of her children Scott Disick dated from 2006 to 2015. They're seen above with the kids over the 2018 holidays

Baby daddy: Kardashian and father of her children Scott Disick dated from 2006 to 2015. They're seen above with the kids over the 2018 holidays

Turns out this was not a first meeting. 'They have met once before, but it was brief,' said a source. 

But she might not feel the same way, it was added. 'He's not her type at all,' said a pal.  

Kardashian and father of her children Scott Disick dated from 2006 to 2015. Following their split, she embarked on a relationship with Algerian model Younes Bendjima.

The star was last linked to actor Luka Sabbat, after the pair were seen kissing last fall. 

Working for Yeezy too: Here Kourtney is seen in an image taken on Sunday; she is with from left, Mason, Khloe, Reign, Kanye and Kim

Working for Yeezy too: Here Kourtney is seen in an image taken on Sunday; she is with from left, Mason, Khloe, Reign, Kanye and Kim

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Kourtney Kardashian shows off her toned figure... after John Mayer lashes out

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