Taylor Swift shows Harry what he's missing in backless gown

The newly-single country star looked ravishing in a glamorous Donna Karen plum gown that ended in a deep V to reveal her slim back.

She put on a brave face despite sources saying the One Direction star called off their one-month long relationship because he was getting increasingly frustrated with her prudish ways.

Arriving solo, Taylor was in lively spirits during red carpet interviews, but avoided all talk of Harry, instead saying of the awards do: “It’s cold but it’s the most exciting experience.”

But inside the bash she had to smile through gritted teeth as host Tina Fey mocked her short-lived relationship with the signer.

The comedienne rounded up a section of the awards by making jokes about how drunk the audience was getting, then said: “You know what Taylor Swift, you stay away from Michael J Fox’s son.”

After being greeted by cheers and applause from the A-list audience she added: “Or go for it.”.

Tina continued: “She needs some me time to learn about herself,” referring to Taylor’s reputation as a serial dater

But last night Taylor proved that revenge is a dish best served hot, as she wowed crowds in the striking backless gown with fishtail train.

Wearing her hair in a grown-up side bun, she kept her make-up simple and accessorised beautifully with drop diamond earrings.

Taylor was nominated in the Best Original song category for Hunger Games song Safe and Sound, but lost out to Adele for Bond title-track Skyfall.

It’s been revealed she’s already penned FIVE songs about her break-up with Styles – despite the couple only splitting less than two weeks ago.

A source said: “Lyrics have been written, but Taylor hasn’t come close to deciding whether she’ll ever release them.

"A song about it will surface at some point but it won’t be anything like the way she had a dig at her other ex John Mayer in one of her other tracks.”