Britney made the confession in a new interview, in which she was asked whether she would consider walking down the aisle with Charlie in Las Vegas.
Refusing to dismiss the idea, Brit giggled as she told Extra: "You never know!"
Britney, 33, has been dating writer and producer Charlie since last autumn and she is clearly a smitten kitten.
The US singer is currently in residency at Las Vegas' Planet Hollywood and recently performed while wearing an 'I heart Charlie' vest top.
When asked what Charlie thought of her choice of clothing, Britney also revealed to Extra: "He was like, 'You're the sweetest girlfriend in the whole world'. He was really happy that I did that."
Grinning from ear-to-ear, she added: "I'm very blessed to have him in my life."
If Britney was to tie the knot with Charlie in Vegas, it wouldn't be her first time as a Sin City bride.
In January 2004, the pop star stunned the world when she married her long-term friend, Jason Alexander, at the Little White Wedding Chapel. However, it wasn't to be and the couple annulled the marriage just 55 hours later.
Britney wed again later that year, marrying backing dancer Kevin Federline. The pair have two sons together, Jayden James and Sean Preston, but divorced in November 2006.
Could Charlie be the Prince Charming Britney has been waiting for?
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