Demi Lovato [1] is so happy for Iggy Azalea's engagement to basketball player Nick Young — just look at her ecstatic face after finding out the news. Demi posted an Instagram picture of her reaction [2] and captioned it: "Could not be happier for this woman . . . (And yes this was literally my face for about an hour) Still can't believe I got to witness that last night. So happy for you both . . . Love you so much lady." Iggy is showing off her insane $500,000 10.43-carat ring [3] right after Nick proposed in front of family and friends during his 30th birthday celebration. Check out the pic above, then watch video of the proposal [4].