The 'X Factor' star was pleased to hear the 33-year-old royal is to marry the 'Suits' actress aftee 16 months of dating and is looking forward to them starting a family together,
Speaking on UK TV show 'Loose Women', she said: ''I'm so happy for him that he's found the love and is going to start his own family, that makes me happy for him.''
A host of other famous faces have taken to Twitter to share their excitement at the impending nuptials, which will take place in spring 2018
TV presenter Holly Willoughy shared a 'This Morning' Instagram post and wrote: ''Soooo exciting... congratulations! (sic)''
Former 'X Factor' star Rylan Clark Neal wrote: ''OH I LOVE IT!
#PrinceHarry #MeganMarkle #RoyalWedding xxx (sic)''
Rather than a standard congratulatory message on social media, comedian Jack Whitehall - who is a friend of Harry's - was keen to know whether he would be invited to the prince's bachelor party.
He tweeted: ''1. When is the stag do? 2. Can I come? (sic)''
Harry's family were also delighted with the news, including his grandparents Queen Elizabeth and Prince Philip.
A message on the Royal Family Twitter account read: ''The Queen and The Duke of Edinburgh are delighted for the couple and wish them every happiness.''
His brother Prince William and his wife Duchess Catherine said: ''We are very excited for Harry and Meghan. It has been wonderful getting to know Meghan and to see how happy she and Harry are together.''
The American actress' parents, Thomas Markle and Doria Ragland, have wished the couple a ''lifetime of happiness'' together.
They said in a statement: ''We are incredibly happy for Meghan and Harry. Our daughter has always been a kind and loving person. To see her union with Harry, who shares the same qualities, is a source of great joy for us as parents.
''We wish them a lifetime of happiness and are very excited for their future together.''