The duo was seen at a star-studded party at the Sundance Film Festival in Utah, reports people.com.
The couple arrived together at a dinner bash Monday for her upcoming movie “The Bachelorette”.
They kissed and hugged, and also grooved with fellow guests, including actors Will Ferrell, Justin Long and Rashida Jones.
“Kirsten and Garrett have been spending time together since the holidays. They were friends on the set of ‘On the Road’, and now they’ve grown closer. They spent Christmas together and he feels very strongly about her,” said a source.