Enrique Iglesias felt "so bad" when he accidently "screwed up" Jennifer Lopez's birthday surprise.

The Spanish singer is currently touring with Jennifer. The Latino beauty celebrated her 43rd birthday this week, and while the pair have formed a firm friendship, Enrique regrets being so open with the star at times.

"She had a surprise party and I didn't even know about it, and I was like, 'I'm trying to make it to your party for your birthday!' I felt so bad, I was like, 'Oh my God, I can't believe I just screwed that up,'" he laughed in an interview with Extra.

Enrique hopes to make the most of their friendship by collaborating on some songs. The 37-year-old star also wrote Jennifer's track Dance Again and was happy to hand the song over to the star.

"We've actually sang a few songs together in the studio. By the time we do it it's going to be hopefully half way through the tour, or as soon as possible," he said. "Even if it doesn't happen during the tour, I want to work with Jennifer for a long time.

"It's strange, because I actually wrote that song for myself, but when I wrote it I was like 'This is not for me, this is for a girl.'"