Robert Pattinson not taking Kristen Stewart`s calls?

London: `Twilight` star Kristen Stewart reportedly kept calling boyfriend Robert Pattinson on Valentine`s day, but the actor didn`t respond. The 22-year-old actress, who did not exchange cards with Pattinson, bombarded the 26-year-old actor with calls while he is in Australia filming for new movie `The Rover`, reported Sun. "Stewart only got an engaged tone," a source said. The `Snow White and The Huntsman` star spent her Valentine`s Day with her mother, Jules Stewart. "Kristen spent the day with her mom, and her little brother Taylor Stewart," the source added. PTI