The cast of Barbie had a sleepover party, yet no one clued American Ferrera in that it was a “sexy” sleepover party.

What are the Barbie Slumber Party Pajama Screenings? Another dress-up-type screening, these late-night parties encourage guests to wear pajamas and bring a pillow.

Margot Robbie said the Barbie cast sleepover was "as fun as it sounds" and took place at a hotel in London, where co-star America Ferrera showed off her competitive side.

Mattel continuously promoted seemingly unhealthy habits to young buyers, including the 1965 Slumber Party Barbie that featured a bathroom scale permanently set at 110 pounds and a book titled ...

BARBIE Slumber Party Pajama Screening Alama Drafthouse Cinema will host late-night slumber party screenings where attendees are encouraged to wear pajamas and BYOP (bring your own pillow).

A Barbie brunch will feature breakfast tacos and French toast. Lastly, the slumber party screening will recreate a sleep-over atmosphere featuring a strict pajama dress code.

In 1965 the Slumber Party Barbie doll came with some bathroom scales that were set to 110lbs. Not only did the doll come with scales and a 'goal weight', but it came with a diet book too.

Ferrera amusingly shared that she had not received the dress code memo for the Barbie sleepover party at Claridge's Hotel in London before filming commenced.

Over the last 64 years, Barbie and Ken have endured their share of scandals. Here, some of the most controversial dolls to ever hit toy stores.

In the middle of her own disco party, Barbie asks her gold-lamé-clad friends, “Do you guys ever think about dying?” and the music suddenly stops. No one responds.

And she's had fun bonding with the other Barbies on set. While shooting, the film’s cast had a slumber party to bond, and America showed up dressed as a grandma.