Pregnant Amanda Holden shows off growing baby bump in Princess Fiona costumeAmanda Holden/Twitter/TwitPic

Five months into her pregnancy and Amanda Holden's Princess Fiona stage costume for Shrek the Musical is feeling the strain.

The star has tweeted a series of cute pictures of her expanding tummy filling out her sparkly green stage costume.

Pregnant Amanda Holden shows off growing baby bump in Princess Fiona costumeAmanda Holden/Twitter/TwitPic

She posted one shot, which shows her rounded bump with the caption, 'Princess Fiona's expecting an Ogre!!' and another showing her in her revealing tap dancing outfit, with the line, 'And now for the Tap dance!!! Bring it on!!'

Later, the mum-to-be tweeted another picture showing her in her wedding outfit for the Shrek finale, joking that she was having a 'shotgun wedding.'

Pregnant Amanda Holden shows off growing baby bump in Princess Fiona costumeAmanda Holden/Twitter/TwitPic

The Britain's Got Talent star has just nine shows left before she hands over to her replacement for the musical, Girls Aloud star Kimberley Walsh.

Announcing her pregnancy last month, Amanda said she would be leaving the show early to look after herself and her baby, following her stillbirth earlier in the year:

'Due to its physical content this means I will end my contract with Shrek The Musical eight weeks early. I will endeavour to continue the show until the 3rd October. I do however ask you to bear with me as I will be putting myself and this pregnancy first.'