Muppets' message to William and Kate

Video caption, Muppets' message to Kate and Wills, footage from Disney

Another top celebrity couple have sent a special message to the royal baby.

Kermit the Frog and Miss Piggy recorded a message for the Duke and Duchess of Cambridge to congratulate them on the birth of their son.

Other stars including Cheryl Cole have been among those to send their congratulations to the new parents on Twitter.

The Muppets are in London filming their new movie Muppets Most Wanted.