This isn't the first time Jen has worn jewelry on her ring finger. Last summer she appeared on the "Daily Show With Jon Stewart" wearing a gold ring in the sacred spot.
The star is continually plagued by gossip about marriage, kids, and her ex-husband Brad Pitt.
Last month she addressed rumors that she was pregnant. She told GQ, ""I'm not having triplets. Not having twins. Nor am I having one baby. I did not elope...You heard it here. I'm not knocked up now."
Jen and Justin have been together since May. They met while making the film "Wanderlust."