Twitter has been abuzz with chatter about the Duke and Duchess of Cambridge's good news - with Cheryl Cole, Olly Murs, David Walliams, Rochelle Wiseman and TOWIE cast members among the well wishers.
Chezza wrote: "I'm sooooooo excited that we're having a royal baby !!!! Congratulations to Kate and Wills !!!!!!"
Olly tweeted: "Cool #royalbaby that's amazing news!! Dam it how comes they never mentioned it on the XTRA Factor last week haha."
And Vernon Kay wrote: "Congrats Wills and Kate....Great news.The calpol is in the post."
David Walliams played it straight by tweeting: "Congratuwelldone William and Kate. Very happy for you both. Dx"
While his fellow comedian Al Murray went for a laugh instead with: "I think Wills and Kate need to watch it with all the Union Jacks and that or social services'll have that baby off them pronto #satire."
And Katherine Jenkins wrote: "What lovely news!! Congratulations to the Duke & Duchess of Cambridge!! #PitterPatter." The Only Way Is Essex cast member Lucy Mecklenburgh commented: "Omg! Royal Baby! Congrats Will & Kate!x"