Ireland Baldwin shared a picture with her Twitter followers on Friday showing a white bikini line running across her pink back.

Ireland Baldwin, 17, accompanied the snap, in which she is wearing a pair of denim shorts and backless top, with a short, simple message: “Tan lines.”

Last week the aspiring model shared several snaps of herself enjoying the sunny weather on the beach in Santa Cruz, California, describing the coast town as one of her “favorite places on earth”.

Ireland Baldwin shared a picture with her Twitter followers after Santa Cruz holiday

Meanwhile Ireland – the daughter of Alec Baldwin and Kim Basinger – says she is excited about becoming a big sister to her father and new wife Hilaira Thomas’ baby.

Ireland Baldwin said: “I have always wanted a sibling, I’m so excited to meet my sister. I want her to know that I’m here for whatever she needs.”

The young model also revealed she has a great relationship with her stepmother, Hilaria Baldwin.

Ireland Baldwin told People magazine: “I love Hilaria. She saved my dad, getting him into amazing shape. And she brought him out of a bad place of being lonely.”

While Ireland Baldwin’s parents had a bitter break-up, she insists they have put all of their differences aside for her sake.