Jessica Biel
was at the 2012 ESPY Awards last night to present the Best Breakthrough Athlete award to Jeremy Lin with Tim Tebow.

The actress looked angelic in a white Christian Dior dress, but all eyes were on her massive engagement ring (courtesy of fiance Justin Timberlake).

The giant square-cut sparkler wasn't Jessica's favorite accessory. She tweeted about how she loved her Nicholas Kirkwood for Roksanda Ilincic pumps. The white shoes may have looked plain from the front, but the neon yellow heels added a perfect pop of color.

The normally poised starlet was worried about her height next to so many pro athletes (don't worry Jess, at 5'8" you're definitely taller than Hayden Panettiere) and cussing in front of her co-presenter Tim Tebow.

Check out photos of the ring and more show photos from the ESPYs above!

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