Keeping herself fit and looking amazing (as always!), newlywed Hilary Duff has much for which to be thankful: gorgeous new hockey player husband Mike Comrie, a fabulous new home, successful career, and an amazingly double-stuffed bling that calls her ring finger home.

Hilary was caught by cameras yesterday leaving the gym looking toned and fabulous in a sleeveless white top, jeans and yellow heels, and they caught a great shot of her sparkly engagement ring. Check it out in the second photo below.

Exactly how large is that gem? While no one has said for sure, it reportedly is estimated to be at least 10 carats, with an estimated value of a cool $1 million US Dollars.

Congrats and best wishes to the happy couple!