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Simon Cowell may be keeping mum on whether he really put an engagement ring on makeup artist Mezhgan Hussainy's finger, but one thing's undeniable: The normally cantankerous American Idol host is in an awfully good mood lately!

Last night, he stepped out for a late dinner with his girlfriend at Ago and had some unusually mild commentary to offer when asked how the taping went.

"I think it went alright," he offered. And once the paps asked to see the reportedly huge rock he bought his ladylove, Simon joked around...

"Where's my ring?" he deadpanned, before borrowing a waiter's silver band and showing it off to the photogs.

"He's got it!" his gal-pal told paps as she got into the car.

(Nice try, but you can see the serious bling on Mezhgan's ring finger if you pause the video at 1:08.)

Even as the twosome were chaffeured away after saying their thanks to the staff, the sometimes stoic Simon giggled like a schoolgirl in the backseat.

Whether the ring means they're actually walking down the aisle or it just symbolizes the perennial bachelor is finally "committed" (according to Ryan Seacrest), we like this softer side of Simon we're seeing.

—Reporting by Daniel Ramos

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See who else was out and about in Party Pics: Hollywood!