costars Zoe Kravitz, 22, and Michael Fassbender, 34, couldn't keep their hands off each other during a romantic stroll through NYC's West Village on Sunday.Earlier that morning, the two had brunch with a handful of friends, including Kravitz' ex, actor Ben Foster, 30. "They're really low-key, but they have a great time together just talking music or movies," a source tells Us Weekly.series, but many hot Hollywood guys know her as something else — girlfriend!In just 26 years she’s been on this earth, Lenny Kravitz’s daughter sure has made her way through a fair share of guys.The two didn't go public until October 2011, however, and stayed together until June 2013.
PHOTOS: Famous star families "For how good looking and smart he is, Michael's pretty shy," the source tells Us."She is actually the one taking care of him most the time.No judgement or anything — we’re actually kinds jealous!Have you Although many people believed she was still dating Michael Fassbender at the time, Zoe was seen leaving an after party with Penn in July 2011.PHOTOS: Undercover lovers Though the costars began dating while filming the Marvel flick in 2010, this is the first time the two have been photographed together (excluding promotional appearances). "They really didn't want to be a topic of conversation during the press for ." As for their 12-year age difference, the source tells Us that "Zoe's really mature for her age in that she has very strong opinions and she is very confident in herself.