Perry tweeted rave reviews about One Direction star Zayn after seeing him dress as a sexy secretary for 1D's hilarious new music video 'Best Song Ever'.
Zayn plays 'Veronica: The Sexy Assistant' and undergoes a dramatic transformation as he swaps his stubbly beard and messy hair for long brunette locks and breast enhancements.
Taking to Twitter, Perrie said: "The #BestSongEver video is my absolute fave! Slightly worried that my new girl crush might be my boyfriend! #Iwould ;) aha, LOVEIT Perrie <3"
'Veronica' dances around in a light blue shirt, black pencil skirt and glasses, and even spends part of the video flirting with heartthrob Harry Styles.
The 'Best Song Ever' video, which premiered on Monday (22 July) sees the boys - Zayn, Harry, Niall Horan, Liam Payne and Louis Tomlinson - appear as themselves alongside their alter egos. The single is also the theme song to their forthcoming movie biopic This Is Us.
Meanwhile Perrie's bandmate, Jade Thirlwall, was impressed with Liam's transformation as 'Leeroy: The Choreographer'.
She said: "Can't stop laughing at the new 1D video for #BestSongEver :D I'm thinking Leeroy should choreograph our next single...xxjadexx."
Watch the hilarious 'Best Song Ever' video by One Direction below: