The 27-year-old actor was recently linked Keogh and while they have been trying to keep their relationship under wraps, Pattinson is said to be smitten by her, reported OK magazine.
"Rob and Riley are having a really great time together, event though it's very early. There is an attraction to each other. They just get each other," a source said.
"Rob thinks Riley has a cool level head and is not impressed by stardom at all. Rob just loves that about her."
"He loves that she'll go into his kitchen for like 10 minutes and come back with a delicious plate of pasta. They just do typical stuff that has pretty much started all his relationships. They get into debates about politics, human rights, things they had read in the papers that morning.
"She's pretty good on the piano and he'll often pull out his guitar and they'll have a mini jam session, making up silly songs and funny limericks," the source said.