The singer, 22, showed off the inking in a picture posted on Little Mix's official Twitter account. She shared the snap just minutes before the girls appeared on C4's Sunday Brunch this morning (15 December) to promote their new album Salute.
The new tattoo on her left arm is of a large rose which appears to grow from her wrist to her elbow.
She already has two script designs - "A tiger never loses sleep over the opinion of sheep" on her leg and "#Music is the strongest form of magic" on her arm.
Fans reacted well to the new body art, with one saying: "LOVE Jesy Nelson's tattoo. Wish I could pull that off."
Another said: "Jesy's new tattoo OMG it is flawless."
It's not clear exactly when Jesy had the tattoo done, as it was noticeably absent when Little Mix appeared at Clyde 1 Live 2013 at SSE Hydro a few days ago (on 13 December).
Jesy, Perrie Edwards, Leigh-Anne Pinnock and Jade Thirlwall performed at the music event, as did Union J, Tom Odell, The Vamps, Rizzle Kicks, Gary Barlow and The Saturdays.
What do you think of Jesy Nelson's new tattoo? Tell us what you think below!
Watch the video for Little Mix's single 'Move':