Cousins True, Chicago, Stormi and Dream spent their Wednesday evening learning a new language!

Khloé Kardashian shared moments from their adorable baby class on her Instagram Stories, which show the little tots rocking out to a number of nursery rhymes — including a Spanish one.

In one clip shared on the Revenge Body star's Instagram Stories, Kardashian's 9-month-old daughter, who she shares with boyfriend Tristan Thompson, can be seen dancing along to the tune with her older cousin Dream, 2.

In a different video, True and Dream bobbed along to “Wheels on the Bus.”

True appeared to be really into the tune as she beamed as her mother made a wheel motion with her hands.

Meanwhile, Kim Kardashian West‘s 1-year-old daughter Chicago wasn't a fan of the son but she was a fan of the props. When the camera panned over to show Chicago, she was holding a bus driver's hat over her face.

Khloé Kardashian with True Thompson
Khloé Kardashian with True Thompson

The babies later had some interactive fun playing on drums. However, instead of using the drumsticks to make noise, baby True decided to chew on hers — that is until it was taken out of her mouth.

Stormi also joined in on the drum fun as Kardashian shared a photo of True, Chicago and Kylie Jenner‘s 11-month-old beating on the instrument. “The triplets,” Kardashian wrote over the snapshot.

For the occasion, the cousins dressed casually with True wearing a blue onesie, Dream in a blue tracksuit while Chicago and Stormi wore neutral-colored onesies.

True and Dream. Khloe Kardashian/Instagram
True and Dream. Khloe Kardashian/Instagram

Of course, this isn't the first time the youngest Kardashian kids came together for an evening of fun.

In October, Kardashian threw a cousin cupcake party to celebrate True's half-birthday.

Kardashian shared an adorable photo of True sitting on a blanket in the grass next to Stormi, Chicago, Kardashian West's son Saint, 3, and Dream.

Also on the blanket were different sprinkle-topped cupcakes, which had the oldest of the famous kids entranced, and a big sprinkle-covered cake for the half birthday girl.

“Cousin Cupcake Party!!!” Kardashian captioned the Instagram adding, “Keeping Up With The Kousins,” poking fun at their E! reality series.

True's other cousins, North, 5, Penelope, 6, Mason, 8, and Reign, 4, were missing from the sweet shot.