HAPPY BIRTHDAY TO THE SEXIEST LADY ON EARTH.

Ashley gushed over her big sister, writing: 'We celebrate you, Jessica Hart.'

She continued: 'We thank God for you! We love you, we support you, we honor and respect you, we value your very existence.' 

'We celebrate you, Jessica Hart:' Ashley Hart celebrated her older sister's 30th birthday by sharing a snap of the siblings and their friends enjoying the Bahamas on Friday

Ashley also shared a cheeky solo snap of herself wearing a very revealing one-piece swimsuit that highlighted her ample behind. 

The blonde beauty hasn't quite soared to the same career heights as her sister, but her girl-next-door good looks have landed her multiple covers of Women's Health magazine. 

Jessica officially kicked off celebrations for her 'birthday week' on Friday, one day ahead of the big day on Saturday. 

Flying solo: Ashley also shared a solo snap of herself wearing a skimpy swimsuit 

'May the celebrations begin!' Ashley Hart shared this photo of sister Jessica on Friday during her 'birthday' week during which she will turn the big 3-0