Lena Dunham

Lena Dunham

Lena Dunham was shocked to discover her boyfriend once dated Scarlett Johansson.

The 'Girls' creator and star admits it was "so surreal" to come across a picture of fun. guitarist Jack Antonoff and the 'Avengers' actress on a Tumblr blog called Old Loves, which is devoted to photographs of celebrity couples who have broken up.

The 27-year-old actress told Grantland's Channel: "The craziest thing that ever happen to me, was like, Old Loves is my passion, I check it like once a week. It's how I kick back on a Friday night is to see what Old Loves has done.

"And I was going through it and I saw my boyfriend and his girlfriend from high school. Scarlett Johansson.

She added: "I know I shouldn't spill that in a public forum, but you can Google it."

The 'Some Nights' rocker, 29, dated the 29-year-old blonde beauty, who is now engaged to French journalist Romain Dauriac, for a year when they were 17 while they attended the Professional Children's School in New York City.

But Lena, who also admitted she had crushes on Jimmy Fallon, Jake Gyllenhaal and Jared Leto, insisted she wasn't upset by the photograph.

She said: "I'm not jealous. It's very sweet. I love looking at pictures of them. She's beautiful, he's beautiful, but it was just so surreal to be looking through this blog that gives me so much pleasure and then there's my boyfriend. And I was like, 'My mind is going to explode.' I really did think I was hallucinating. It would be like seeing my parents."