Alyson Hannigan has taken to Twitter to deny reports she may be pregnant again.

The Buffy The Vampire Slayer star was pictured enjoying a day out at the fun fair with her daughter Satyana and her husband and fellow Buffy star Alex Denisof, and bloggers pointed out she had what appeared to be a baby bump.

But Alyson made light of the rumours, writing: "NO, I'm not pregnant! I just ate too much carnival food, that time of the month, hurt my back & couldn't suck my gut in, & need 2 do cardio!"

Instead of hitting out at the bloggers, she announced: "I do LOOK pregnant in that photo!"

And she added: "And I'm NEVER gonna wear that shirt again!!!"

Alyson, 37, currently appears in How I Met Your Mother, which her husband Alex has also appeared in.