Credit: Jamie McCarthy/

Jessica Simpson just can't keep quiet about her latest beau, former NFL star Eric Johnson.

On Monday, she posted a close-up shot of him on her Twitter account, along with the caption: "I have a major crush on you."

The 30-year-old singer -- who has had a series of dead-end relationships since splitting from Nick Lachey in 2005 -- has been very vocal about her new guy since they began dating earlier this summer.

Last month, she posted a photo on Twitter of them kissing. "YUM!" she wrote.

Tell Us: Will Jessica and Eric last?