The 42-year-old singer is expecting twins with husband Nick Cannon and said that even pregnancy hasn't been able to stop her from swimming.
She told OK magazine, 'As far as exercise, I love the water. I always have. I was swimming daily until the doctors advised me to limit my activities. There will be a time for that afterwards.
'People that know me call me a mermaid because I love the water so much, be it an ocean, lake, water park, even a river or a creek.
'I'm actually in the bath tub right now.'