Looking gorgeous, mum-to-be Billie posed in an orange bikini and sunglasses for the sunsoaked picture, uploaded to Instagram on Thursday (30 January).
As the snapshot focused on the happy couple's faces, we can't get a glimpse at Billie's baby bump, as is the case in all her other holiday photos!
Boutique owner Billie became the first TOWIE star to announce a pregnancy when she confirmed earlier this month that she and Greg are expecting a baby.
Billie revealed the happy news via Twitter on 7 January, writing: "I am so happy to tell you all, that Greg and I are expecting our first baby! We are so excited!! Thank you for all of your kind messages."
She added later that day: "Thank you again to everyone for your kind messages, it means a lot."
Billie and ticket broker Greg have always kept their relationship away from the limelight, including the TOWIE cameras, but we've heard rumours he might pop up on the new series of the ITV2 show, which starts next month. Fingers crossed!
The couple are currently enjoying a luxury holiday in the Maldives (we know, we're jealous, too), and Billie hasn't been able to resist sharing photos from their gorgeous trip with fans back home in the UK.
Her holiday meant she missed watching sister Sam Faiers' exit from the Celebrity Big Brother house during Wednesday night's finale, where she finished in fifth place.
She had, however, been championing her sibling all the way, even encouraging fans to vote for Sam while in the Maldives. That's sisterly love for you!
TOWIE returns to ITV2 for its eleventh series in February, followed by another new series in the summer and then one in the autumn.
Billie has said her baby is due around June so it looks like we'll be seeing a new addition to the TOWIE cast before the end of the year!
More celebrities who have announced pregnancies in 2014 below!
Copyright: WENN Lexie Appleby/Future Image/Bridow/Instagram