It wasn't just the heart of every Robert Pattinson fan that sunk when they saw photos last week of him smooching co-star Emilie de Ravinwhile shooting scenes for their upcoming film Remember Me.His on and offscreen love interest Kristen Stewart was none-too-pleased with what she saw. A source close to the couple says, "She knows screen kisses are Rob's job, but it doesn't make things easier, seeing sexy photos of him and Emilie in full lip-lock." A friend of Rob's puts it more explicitly: "Kristen saw a photo of them kissing and flipped out." And according to some who were on the beach that day tell OK! that both R-Pattz and Emilie seemed to be enjoying the scene. "Everyone else was setting up for the next shot, but Rob and Emilie stayed where they were," says the eyewitness. "Emilie snuggled with him for at least 10 minutes. She was sitting with part of her body pressed up under his arm and they were making each other laugh. They're definitely getting close, you can tell it's more than a work relationship." The co-stars have also been spending some time together when they're not filming. On June 19, they hit poshSoho House , where they shared plenty of face time in a private smoking room. Just three days earlier, the duo were spotted at Gemma, a restaurant at The Bowery Hotel, one of their favorite haunts. "They spent a lot of time telling jokes, laughing and whispering in each other,s ears, an eyewitness tells OK!. "At one point Emilie took Robert,s Ray-Bans and awas playfully wearing them before putting them back in his shirt pocket, it was very flirty. Rob was so sweet and attentive; if I didn't know anything about him, I would had thought Emilie was his girlfriend!" Whether or not she believes anything's going on between her man and his beautiful blonde co-star, friends tell OK! that the incident has "made Kristen nervous and more determined to visit him in New York... It's clear Rob and Emilie have a lot of chemistry. Kristen is hoping it hasn't spilled over into real life."