Matthew McConaughey
popped the question to Camila Alves over the holidays -- but we're only just now seeing the first shot of the ring!

Matt's bride-to-be debuted the brand new sparkler last night at the QVC Fashion Week party in NYC, the first time we've seen her out in public since Matt proposed on Christmas Day.

The 29-year-old model and 42-year-old actor have been together for over 5 years and already have two children together, son Levi and daughter Vida. No wedding date has been announced.

How'd Matt do? Check out some more celeb engagement rings in the gallery above!

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