"Kate looked every inch a Princess!" wrote an enthusiastic Amanda Holden. "Beautifully simple and elegant! And handsome William her Prince Charming! What a dream!!"
Jenni Falconer agreed with her. "This truly is the stuff of fairytales. Stunning." Coolen Rooney described her as a "breath of fresh air" and "very tasteful".
Meanwhile Martine McCutcheon said she was feeling "very moved". She said: "Keep thinking of the wonderful Diana looking over her boys and the gorgeous Kate... So proud to be British."
She wasn't the only one feeling emotional. Patsy Palmer admitted to being "a little teary" in her tweet to Philip Schofield.
And even American stars were getting involved. "Can't wait for the royal wedding!!!" wrote Miley Cyrus. "Who isn't jealous today, people?"
Best of the celebrity royal wedding tweets
- Amanda Holden "Kate looked every inch a Princess! Beautifully simple and elegant! And handsome William her Prince Charming! What a dream!!"
- Martine McCutcheon "Wow I'm feeling very moved. Keep thinking of the wonderful Diana looking over her boys and the gorgeous Kate... So proud to be British x"
- Coleen Rooney "Kate looks beautiful breath of fresh air!! William and Harry look very smart aswell! Very tasteful
- Patsy Palmer - "Wishing everyone at wedding best wishes. Am a bit teary!! Good luck lovely William and Katherine.xxx."
- Joe McElderry "Hyde Park looks amazing with all the people there!! Looks like an amazing atmosphere :) x."
- Miley Cyrus "Can't wait for the royal wedding!!! Who isn't jealous today, people?"
- Sharon Osbourne "Just saw Prince William & Prince Harry arrive at Westminster Abbey. Magnificent Men. Diana would be so proud."
- Lisa Snowdon "Ahhh the Princes look so handsome! So proud to be British."
- Jenni Falconer "This truly is the stuff of fairytales. Stunning."
- Henry Holland "Perfect wedding. Who knew I was such a royalist?!"
- Louis Walsh " Everybody loves a great wedding, what an amazing day, William & Kate."
- Elen Rivas "I can't even begin to imagine how lovely Kate and William are feeling at the minute... I wish them both all the happiness in the world...xx."
- Jason Gardiner "Right I'm overcome with emotion for them both. Kate is so regal and poised graceful and elegant. Every bit a Princess."
- Calum Best " What a Powerful Royal Wedding. Best wishes to them."
- Keyshia Cole "So wonderful to see the royal wedding. I hope they last FOREVER. I'm happy to say I've seen many great events in my lifetime.." !!!!! :)"
- Jamie Oliver "Royal wedding day !! national day off!! have a great day today guys, I hope it includes family, friends, bad dancing food and a little drink"
- Paloma Faith " Paloma Faith "New Britain represented!!!!All genders all races all shapes and sizes! Wow! This makes me so happy! GO ON BRITAIN!! So proud to be a Londoner."
- Ronan Keating "All the best To Kate And Will today and for the life together. God Bless them. X "
- Alexandra Burke "The day is finally here. The royal wedding
- Danyl Johnson "I know that it might not be everyone's cup of tea but I'm excited about the royal wedding. :-) it's so nice to see true love!!"
- Peaches Geldof " to admit... I'm in LA Have but I've already got pre-royal wedding jitters."
- Emma Bunton "Good morning royal wedding day, how exciting! Breakfast is calling me, flags and tiaras are ready!"
- Stacey Solomon " Good luck Kate and wills we will b watching. xxx"