It's been two years, but Taylor Swift still can't Let It Go. By that, we mean the song, not some boy she wrote songs about.

During her Halloween performance in the Tampa Bay, Florida leg of her "1989" tour, the 25-year-old star invited Broadway talent Idina Menzel onstage in full "Frozen" costumes, for their own rendition of the song, "Let It Go". Menzel dressed as her character, Queen Elsa while Swift came onstage as the summer-loving snowman, Olaf.

The fun did not stop there, either. People reported that the singers did a quick change: Swift in a sparkly sequined dress, and Menzel in a hot all-black number.

Swift took the performance to Instagram after, writing, "Frozen totally happened tonight. And 55,000 people sang 'Let it Go' so loudly, it nearly took my breath away. Good times." Menzel also shared some love, writing back to Swift, "Thank you @taylorswift! That was definitely an out of body experience. Or out of Elsa's body experience! #1989tourtampa."

Menzel is only the latest in the slew of celebrities that Swift invited on her tour. The Daily Mail noted that the long list of surprise guests include Mick Jagger, Ricky Martin, Pitbull, Ellie Goulding, Miranda Lambert, Keith Urban, Nelly, Steve Tyler, Leona Lewis, Wiz Khalifa, Avril Lavigne, Selena Gomez, Justin Timberlake, Beck, John Legend, Alanis Morissette, Fetty Wap, Mary J Blige, Jason Derulo, Lorde, Nick Jonas, Haim, The Weeknd, Jason Derulo, Imagine Dragons and even F.R.I.E.N.D.S actress Lisa Kudrow.

The Tampa performance is the last on her US tour. After a week-long break, Swift is returning onstage on November 7 for the rest of her world tour, with two dates in Singapore, three in China and seven in Australia.

In other TSwift news, BBC reported that the country-turned-pop superstar is being sued for $42 million be a man who claims to have the rights to the lyrics of "Shake It Off". The man, identified as R&B singer Jesse Braham claimed that Swift stole the words from a song he wrote called "Haters Gone Hate.

Braham told the New York Daily News, "Her hook is the same hook as mine. If I didn't write the song Haters Gone Hate, there wouldn't be a song called Shake It Off." Braham's song included the lyrics, "Haters gone hate, playas went play/ Watch out for them fakers, they'll fake you every day."

Meanwhile, Swifts included, "Cause the players gonna play, play, play, play, play/ And the haters gonna hate, hate, hate, hate, hate." She also went on to sing, "And the fakers gonna fake, fake, fake, fake, fake."

However, as BBC noted, other than the lyric similarity, there is nothing else similar about Swift's song to that of Braham.