A report over the weekend alleged that Jem and Gary slept together, leading Gary's on-off lover Charlotte Crosby to quit Geordie Shore.
A rep has since confirmed that "Charlotte is not quitting anything", but Jem and Gary have remained silent on the allegations - until now.
Taking to Twitter on Sunday, Jem said she had "no comment" to make, while defiantly telling her Twitter followers that 'hateful' tweets "don't phase" her.
She first wrote: "No one knows f**k all stop tweeting me getting boringggggggg u bunch of lolz [sic]."
When a Twitter user asked her about the situation and the negative comments she was receiving, Jem said: "I stand by no comment as I have a right to - the tweets don't phase me - make me laugh."
Jem did, however, favourite several tweets, which read: "@GazGShore is a lucky man like haha @jem_lucy," and "it takes two to tango."
One user wrote: "@jem_lucy I love Char and Gaz but the stick you are getting for this is unreal!! Whether it's true or not I don't see why u get the grief."
And another one said: "@jem_lucy is getting hate here but she wasn't the one 'dating' charlotte, the blame lies with @GazGShore guys sorry."
Jem, who still appears to be in Thailand (where series five is thought to be filmed), is staying on in the country in an extended holiday, and has been updating fans via Snapchat.
Reveal contacted Jemma's rep who had no comment. We have also recached out to Gary's rep for further comment.
While Gaz's appearance on EOTB was confirmed early last month by Charlotte, she previously said about his stint on the show: "It's a little bit off at the minute, he is literally going on Ex On The Beach now so he's going on dates with people… I don't know. I don't want to get upset again."
Meanwhile, Jem shot to fame on the third series of Ex On The Beach, being introduced on the show as Rogan O'Connor's ex. She struck up a romance with Kirk Norcross, but that quickly fizzled out.
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