The country singer, 28, invited the Twitter universe into her intimate getaway by posting bikini pictures on her page from Mexico.
But the pictures - which show the Grammy award winner on the beach in a blue and white two piece - quickly prompted concern among some of her thousands of followers.
Proud of her body: LeAnn Rimes tweeted this picture yesterday while on her honeymoon in Mexico
A Glasgow-based fan wrote that the star, who married Eddie Cibrian earlier this month, looked ‘scary skinny'.
But Rimes jumped straight on the defence, sayin: ‘Those are called abs not bones love.’
She went on to say: ‘Thx but this is my body and I can promise you I'm a healthy girl. I'm just lean. Thx for your concern but no need to be.’
Skinny: LeAnn Rimes shows off her bones but tweets: 'I am healthy.'
It is not the first time that the figure-conscious star has turned to Twitter to defend her body issues.
In April she took a photograph of her bare stomach and long legs while lounging around with Cibrian, with the caption, 'First sun!!!!! SPRING!!!'
In another posting she wrote, 'Dear lord! I do not work out too much nor do I starve myself. I'm so over this and moving on.'
Rimes and Cibrian were married on a private estate in Malibu, California four weeks ago, after they both controversially left their partners to be with each other.
Curvier: Rimes looked much healthier back in July 2009 as she shopped at the Brentwood Country Mart in Los Angeles