Actor Brian Austin Green has teased fans over rumours his wife Megan Fox is pregnant by refusing to confirm the speculation in a series of playful tweets.

Thank you everyone. We are so happy, before adding, By the way that last tweet does not confirm or deny anything

The actress donned a bikini to show off her 'baby bump' last weekend (24Jun12) as she celebrated her wedding anniversary with Green in Hawaii, where he caressed her hugely-swollen tummy as they posed for photos at a beach.

The pictures prompted fans from around the world to send congratulations to the couple, but Green seems determined to keep the public guessing.

Taking to his Twitter.com page on Wednesday (27Jun12), he appeared to comment on the news by writing, "Thank you everyone. We are so happy," before adding, "By the way that last tweet does not confirm or deny anything".