Happy birthday, Arhaan and Harshvardhan!

Two star kids celebrate their birthday today.

While one of them has made his Bollywood debut, the other has turned 15.

Arbaaz Khan and Malaika Arora's son, Arhaan, rang in his birthday last night by cutting a birthday cake.

His proud mamma shared a picture with the boys and wrote, 'My baby is a big boy now. happy bday my jaan.love u to the moon n back my arhaan #15today.'

Arhaan's maasi, Amrita Arora Ladak, also shared a picture of the birthday boy with her son, Azaan, and wrote, 'Happpppy birthday our 1st born ...love u like wayyyyy toooo much.'

The other star kid is Anil Kapoor's son Harshvardhan, who made his debut in Mirzya.

Sonam shared a childhood picture of her sister Rhea, dad Anil, birthday boy Harshvardhan and herself, writing, 'No matter how old you turn, you’re always going to be my baby brother Happy birthday @harshvardhankapoor.'

'Love you to the moon and back. You’re one of a kind and I wouldn’t have it any other way,' she wrote sharing another picture.

She ended it with, 'The best is yet to come.'

Mom Sunita Kapoor also wrote a loving message for her son, 'Happy Birthday To The Love Of My Life.'