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How will Simon Cowell be as a husband?

"Self-centered!" American Idol host Ryan Seacrest joked to Monday at's 2010 Awards Season Nominee Celebration in Beverly Hills. "But he is very generous."

Generous, indeed.

His fiancee, makeup artist Mezhgan Hussainy, stepped out over the weekend with a huge engagement ring, estimated at $750,000.

"I hope that if they are building a life together, there aren't too many mirrors around to distract him from his girlfriend!" Seacrest joked again.

Seacrest said he never caught Cowell and Hussainy, 36, getting cozy on set.

"The only thing he's probably made out with is the mirror that I've seen at Idol!" Seacrest sniped of Cowell.

What will he get Cowell as a wedding gift?

"My presence. No, I'm teasing!" Seacrest told Us.

Kidding aside, Seacrest said he is still waiting for his invite.

"I don't know that there is a wedding," he told Us. "I have not seen an invitation!"