1D members dance around shirt-less in a promo video for Jason Derulo's Talk Dirty.

It seems that the R&B star has decided to make use of fellow music artists and even Larry King to promote his track. Probably one of the most star-studded promo video ever, the 2-minute clip does not spell "casual" even through the randomness of it all.

The video features no less than Harry Styles, Zayn Malik, Niall Horan, Liam Payne and Louis Tomlinson, lip-synching to Talk Dirty playfully. In fact, Harry and Nialler seem to have aimed too much for a casual feel that both decided to go topless in the promo vid.

The 1D boys appear to have loads of fun in the video, gyrating and dancing to Jason Derulo's track. Harry even went as far as sporting Dracula teeth and wooing some blonde girl carrying a laptop.

As if One Direction wasn't enough, the R&B singer also included Nickelodeon star Ariana Grande who was twirling her hair, all of Fifth Harmony, the 17-year old crooner Austin Mahone and even fiancé Jordin Sparks who showed support to her boo by lip-synching cooly.

Blurred Lines singer Robin Thicke was also in for Talk Dirty, as well as Enrique Iglesias, Bret Michaels, Will.i.am, Larry King and Pete Wentz.

Talk Dirty is Jason Derulo's newest single and was released January 2014 in the US. According to the Daily Mail, the R&B star is set to perform the track at the opening of Dancing With The Stars Season 18 this month.

The Watcha Say singer is reportedly on his Tattoos World Tour, which kicked off last month, notes the Mirror. Jason Derulo's newest and renamed album, Talk Dirty, is due out in the US by April, the Mirror adds.

In the meantime, watch the star-studded promo video for Talk Dirty and the track's official MV in the videos below.