LeAnn Rimes silenced critics who claim she doesn't eat enough by stopping in at burger restaurant yesterday.

The country singer, 29, was seen at Burger King with husband Eddie Cibrian while they waited for their flight at Los Angeles International airport.

LeAnn has had to defend her weight after becoming much leaner in recent months but has always maintained that she has a healthy appetite.

She told Chelsea Handler recently that her weight loss was just a natural progression of life.

"I was a baby! I was fat. I had baby fat," she told the late night host. "I grew up. I work out. There's nothing else to explain."

LeAnn and Eddie were on their way to Sin City to spend some quality time together.

"We're headed to Vegas where we'll get no sleep or workout I'm sure," she tweeted.

The pair are frequent travellers and have enjoyed vacations in Hawaii, Aspen and Mexico in recent months.