Pretty Little Liars actress Lucy Hale has proclaimed her love for Adam Lambert after the singer began recording for the TV series.

As previously reported, Lambert was recently confirmed to appear on a Halloween special of the US show.

The recording has now begun and Lucy Hale, one of the show's stars, took to Twitter to reveal her admiration for Lambert by simply tweeting:

"@adamlambert I officially love you."

Lambert also tweeted about the day's work, adding: "First day on set was fun! Excited for more @lucyyhale!"

Pretty Little Liars cast member Brendan Robinson meanwhile recently offered more details about Lambert's guest role in the show, confirming that the 'Trespassing' singer will be playing himself.