Blake Lively reportedly bought Ryan Reynolds a birthday card dedicated to her "real-life superhero".

The two stars have been linked for the last few weeks. They met on the set of the action movie Green Lantern, but only got together when they were both single.

Ryan portrayed the titular caped crusader Hal Jordan/ Green Lantern in the film, with Blake keen to remind him of where they met on his recent 35th birthday.

"Blake was potted rummaging nonstop through birthday cards at a Manhattan drugstore with a gaggle of gal pals," reports National Enquirer.

"This one's perfect,' gasped Blake It featured a stud in a cape, with a caption that read, Happy birthday to my real life superhero.'"

Previously, the 24-year-old star's friends had suggested she buy one dedicated to her "one and only", or another with a picture of a dog lying on a cluster of alcohol bottles.

The group all agreed the superhero card was the winner, with Blake later queuing up to make her purchase.