The reality TV star posted the revealing picture on her Instagram page last night (4 December), flaunting her trim figure in nothing but a lacy black one piece.
Her risqué underwear features a plunging neckline and a cut out section at the front, showcasing her toned stomach and leaving very little to the imagination!
Sam - who has painted her nails a racy colour of red too - captioned the snap: "Getting bits ready for tomorrow's shoot. Cheeky selfie".
In the background, we can also make out a few pairs of shoes from the Essex star's impressive footwear collection.
Sneaking a selfie in the wardrobe perhaps?
Sam has recently been working out in the gym a lot more in a bid to tone up and get in shape. And it's certainly paid off, since she can't stop taking pics in her underwear!
Not content with showing off her fab new figure yesterday, the TOWIE star then posted a snap of herself with super smooth skin following a pampering session in her hometown.
The photo sees Sam going completely makeup free and cuddled up in pyjamas.
She tweeted: "Chilling #nomakeup in my @SouthBSwim loungewear .. Had the most amazing facial today".
Although she might have been relaxing on the sofa, it is unlikely that Sam was settling down to watch her ex Joey on I'm A Celebrity... Get Me Out Of Here!
Last week, she admitted during an appearance on This Morning that she hasn't been watching her former flame compete in the Australian jungle because it is too hard to see.
However, she also revealed that she does still love Joey and thinks they would have worked out if it hadn't been for TOWIE.
Coincidentally, ex TOWIE cast member Lauren Goodger posed for a candid photo in her underwear last night too!
Is there something in the Essex water?!
Would you ever take an underwear selfie? Let us know below, as the best comment from across the website each week wins £50!