You need to see these photos
The telly star took to Instagram with the CUTEST throwback photos of the pair of them as well as a couple of recent selfies from a glitzy day out.
In the first pic, Sam and Billie can be seen grinning at the camera with their cheeky dimples on full display, while another sees the mischievous sisters playing on a bouncy castle.
A couple of recent snaps see the stunning pair cuddling up while out for a summer dinner, as well as giving their best pouts for the camera.
Next to the sweet post Sam – who shares two-year-old Paul and two-month-old Rosie with boyfriend Paul Knightley – wrote a heartfelt message to her elder sibling.
‘Happy birthday to my beautiful sister @billiefaiersofficial’ she said.
‘You aren’t just my sister you’re my best friend too, I love you with all my heart.’ Before adding: ‘Thank you for being the best auntie I could wish for for Paul & Rosie.’
And fans were quick to gush over the tribute, as one wrote: ‘Lovely sisters hope my two are close like you both. Happy birthday x’.
Another pointed out how similar Sam and her eldest son look, as they commented: ‘omg aww sam looks like baby Paul here!!!’.
While a third simply added: ‘Love this can’t beat sisterly love xx’.
Billie is currently celebrating her birthday while on a luxury holiday in the Maldives with fiance Greg Shepherd and their adorable children, three-year-old Nelly and 10-month-old Arthur.
Other members of the family have also joined the pair on their trip including Billie’s mum, Suzanne Wells as well as Greg’s relatives.
Sharing an adorable photo of her loved ones at Kuramathi Island Resort on Monday, Billie revealed she was having an amazing time on holiday.
‘Birthday celebrations in the Maldives … having the best time ever in paradise’, she wrote next to the snap.
AW! Happy Birthday, Billie!