Is Robert Pattinson the reason behind Kristen Stewart's recent smiles for the press?

Stewart must have something to be happy about as she grinned to cameras on the streets of Paris. The 22-year-old actress appeared in good spirits as she was seen at Balenciaga's Spring/Summer 2013 show at Paris Fashion Week.

This has become a new look for her as she had kept a smile off her face for the last few months after her infidelity with "Snow White And The Huntsman" director Rupert Sanders, 41. The incident caused the very public break-up between her and 26-year-old "Twilight" co-star Pattinson.

Kristen posed in a fashionable yellow biker jacket with black and white floral print jeans and a plain black t-shirt at the French event. But what made the outfit complete was the smile on her face telling everyone how she's feeling about her relationship with Pattinson.

A source for US Weekly reported: "They are living together and have reconciled."

Earlier this month Pattinson and Stewart got together for a face-to face talk to start their amends which seemed to have worked well after what she claimed was a "stupid mistake." Pattinson had reportedly given Stewart a reconciliation ultimatum that he wants "marriage".

"Rob told Kristen the only way he can forgive her affair is if she truly commits to him. Rob has been keen to marry Kristen for quite a while and he doesn't want to get back with her unless he knows she means it for life too," a source reportedly told The Daily Star. "He is desperate to make it work and wants to give her another chance but not unless she proves she really wants it too," the source added.

There are sure to be more smiles to come, especially if wedding bells are in the future.