The source claims 24-year-old Tammy is following Tyga around Australia for his entire tour and that they are “100 per cent together.”
"They travelled up to Brisbane separately and hooked up again later on,' the insider claimed. "She's basically doing his whole Australian tour with him."
"Tammy spent all night backstage (or on the side of the stage) as if she was his girlfriend," another onlooker revealed.
"They were so into each other, it seems there's definitely something going on there," a source said.
"Some people backstage thought they were actually a couple."
However, Tammy’s sister Amy disputed the dating claims, telling the Daily Mail:
"Tammy had backstage passes with a couple of friends for the festival, including our [other] sister who was also there.
"We were all invited, everyone is just friends and were having fun dancing at a festival. This has just been taken out of context."
The Aussie Instagram model – who currently models for Khloe Kardashian’s clothing brand Good American - gained a name for herself last year after she was pictured being carried out of Kylie's 21st birthday party in West Hollywood face-down on a stretcher.
The mother-of-two split from her fiancé, Australian streetwear designer Reece Hawkins some time last year, and while she has remained quiet on the Tyga allegations, Tammy hinted at a new relationship in a YouTube video earlier this month.
"I don't need a man...maybe I already have one," she teased.
Tyga and Jenner started officially dating in August 2015 but had an infamous on-and-off relationship starting in 2014. their romance lasted for about 18 months until they broke up for good in April2017.