Who is @LizTruss? The millennial mistakenly praised for becoming the UK's next prime minister

Twitter user @LizTruss has told Magdalena Andersson to "get the meatballs ready" after Sweden's prime minister sent words of support to the woman who she thought was the incoming UK prime minister.

Liz Trussell (left) is being overwhelmingly mistaken with UK's newest prime minister Liz Truss on Twitter. Source: Twitter, AAP

Key Points

• Twitter user @LizTruss is being inundated with messages on Twitter after being announced as UK's new prime minister.
• Liz Trussell is claiming the new job title, replying to people who have mistakenly tagged the wrong Liz Truss.

Twitter user @LizTruss is being inundated with praise and support after being announced as United Kingdom's next prime minister. Except she isn't set to be the new occupant of 10 Downing Street.

After the UK's Conservative Party appointed Liz Truss as their new leader on Monday, she's been quick to be tagged by politicians and the public as she takes up the top job.

But the account user who owns the Twitter handle @LizTruss isn't actually the UK prime minister Liz Truss. Boris Johnson's successor actually tweets on the handle @TrussLiz.

Liz Trussell, who is also from the UK, is having a bit of fun with it, proudly claiming the new job title she's been granted, replying to dozens of people who have accidentally made the mistake of tagging the wrong Twitter user.

That includes Sweden's prime minister, Magdalena Andersson, who fell into the same trap, tweeting her support for Ms Truss - to Ms Trussell.

Liz Trussell assumed the role of UK's prime minister by responding to Magdalena Andersson in a tongue-in-cheek response to Sweden's leader. Source: Twitter

"Congratulations to @liztruss as she assumes the role of Prime Minister of the UK. Sweden and UK will continue our deep and comprehensive cooperation. Important for our citizens, economies and security," Ms Andersson wrote in a since-deleted tweet.

"Looking forward to a visit soon! Get the meatballs ready," Ms Trussell responded.

Her comical tweets have gained great traction and hundreds of likes from around the world, as Ms Trussell racks up increased support for her tongue-in-cheek comments to online users.

"Petition for @LizTruss to become PM tomorrow in place of @TrussLiz," Matt Dent, a local councillor in England's southeast, said.

Her response? "Where do I sign?"

And after a user expressed her wish for Ms Trussell to be appointed as the new prime minister by Queen Elizabeth, she wholeheartedly agreed.

"Yes!!!!!! Me & Queen Liz would deffo be besties," she replied.

She's made some of her would-be electorate happy already after saying she'll "get right onto that" after being tasked with firing UK's home secretary Priti Patel.

And she has even promised a trip to Las Vegas for everyone after UK's Green MP Caroline Lucas, a strong opponent of the Conservative Party, has supported Ms Trussell after mistakenly tweeting to her too.

"Apologies, my previous tweet about #ToryLeadership should have been directed to @TrussLiz - not Liz Trussell who tweets at @LizTruss - tho frankly she’d probably make a better job of it," Ms Lucas wrote.

"I’m in! Vegas for everybody!!!" Ms Trussell wrote back.

When it was announced Ms Truss succeeded by winning 57 per cent of the Tory vote, she was accused of blanking her hotly contested opponent Rishi Sunak after she failed to shake his hand before making her victory speech.

Ms Trussell apologised, explaining she was busy having a feed.