The EastEnders actress simply captioned the sweet snap: "My world."
In the photo, TOWIE star Dan is seen gazing at his tiny dark-haired baby daughter, who was born on Sunday, 15 February.
Little Selina is dressed in a tiny pink Minnie Mouse outfit. Aww!
Jacqueline, 22, is utterly smitten with her gorgeous little girl and has been sharing plenty of snaps with us lately, including one that was called, "Perfection."
Dan, meanwhile, was gushing about Jac on social media yesterday, posting a cute picture of them cuddling up together with the message: "I love this woman so much."
The couple have been putting on a united front following recent allegations that Dan had been recorded being verbally abusive to his ex-girlfriend Megan, the mother of his one-year-old son Teddy.
In a statement published by The Mirror at the weekend, the father-of-two apologised for the incident, saying: "I am ashamed and embarrassed that I allowed myself to reach such a dark place that I behaved in a way that even I didn't recognise.
"While I acknowledge that there is absolutely no excuse for my deeply regrettable behaviour, I plead for some understanding that I had no intention of violence."
Dan and Megan separated before the birth of Teddy in December 2013.
23-year-old Dan has been on a break from filming TOWIE since Ella's birth, so he can enjoy time with his newborn and Jacqueline, who is on maternity leave from EastEnders.
Dan and Jacqueline - all you need to know in less than two minutes!