Kate looked radiant in a cornflower blue polka dot dress by British designer Jenny Packham, which sparked memories of when Princess Diana walked out of the Lindo Wing in a similar printed dress, cradling baby Prince William. Reality TV star Khloé was quick to pick up on this, posting a picture to Instagram that showed the similarites between the two outfits. "How phenomenal is this picture! Awww #PolkaDotPerfection," she captioned the touching snap.
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Many commented on new mum Kate's fresh-faced appearance. "She looks amazing! Glowing," tweeted Cheryl Cole, while Poppy Delevingne said she looked "beautiful." Another celebrity tweet was Emmerdale actress Natalie Anderson, who excitedly wrote, "Actually cried watching the Royal baby!! 1 yr ago on next wk, we welcomed our beautiful Freddie Puds! #memories."
HELLO! Online has rounded up the best celebrity tweets so far.
Twitter messages for William and Kate
Khloé Kardashian Odom:How phenomenal is this picture! Awww #PolkaDotPerfection #RoyalBaby
Harry Styles:Congratulations to Will and Kate on the birth of their baby. A king is born
Cheryl Cole:She looks amazing! Glowing 😊
Elizabeth Banks:Honestly, I am more impressed with Kate's blow-out than the #RoyalBaby which looks just like a human baby. But that hair!
LeAnn Rimes Cibrian:Ok, after seeing Kate step out with the baby....did she really carry that child?! Lol....she looks flawless! Congrats to them
Amanda Holden:Let's not forget 'Well done' to the medical team! #Midwivesrule
Natalie Anderson: Actually cried watching the Royal baby!! 1 yr ago on nxt wk, we welcomed our beautiful Freddie Puds!! #memories 👶💗
Poppy Delevingne:K Middy looks so beautiful & happy in her powder blue polka dot dress; swear I saw #BabyCambridge give a little royal wave... #hiyawildworld
Busy Philipps:I can't imagine basically doing a press conference 20 hours after giving birth. I also can't imagine giving birth to a future king so...
Ronan Keating:Massive congratulations to Prince William and Princess Kate on the arrival of their Baby Boy.
Coleen Rooney:Awwww that's such a fantastic feeling #proud #parents #happiness. So happy for them all!! X
Rebecca Adlington:Wow Kate Middleton looked gorgeous!!! Congratulations!! Amazing moment! I love the royals! Can't wait to find out the name #RoyalBaby
Coleen Nolan:So happy for William and Kate, she looks fabulous!! Wanted her to pull blanket down a bit so we could see him more! X