The 53-year-old music mogul is having a child with his friend Andrew Silverman's estranged wife, New York socialite Lauren Silverman, who is 10 weeks pregnant, and Kelly, who co-stars with Simon on 'X Factor' USA is thrilled for him.
She told E! News: ''I think Simon will be a wonderful father. It's not my news to share, but I do know about Simon and his character. He's going to be a great dad.
''I think that he is always respectful. Always classy. And I think that he will be like that as a father. He will be a classic father figure.''
Fellow judge Paulina Rubio added: ''I believe he is very much like a leader, so I believe because of that he will be a very good father.''
While 'X Factor' USA's Demi Lovato is happy for Simon, the 20-year-old singer insists she doesn't have any advice for him because he is so much older than she is.
Demi said: ''I don't have any advice to give to someone who has lived like a hundred more years than I have.
''I mean, I might be off by a few, so maybe 110. But I have a lot of fun with him and he's a great guy. He'll be good.''
The beautifully shot advert was released on Sunday and has become a significant hit.
The band re-post his video on their social media page.
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