The 33-year-old songstress excitedly announced that she had finally got involved in the popular photo sharing social network yesterday (15 January), tweeting: "It's official! I've just joined Instagram before it's not cool anymore!"
And she's already racked up over 34,500 followers in less than 24 hours!
Satisfying her thousands of fans' craving to see more from their idol, Jessica was quick to get snap happy and uploaded a couple of cute images of her family.
In one black and white shot, Jessica is seen snuggled in between her younger sister Ashlee, her new fiancé Evan Ross and her whopping diamond engagement ring.
The caption read: "Family moment".
Evan and Ashlee got engaged while on holiday in Hawaii recently, after dating for less than a year.
Their relationship has gone from strength to strength in their short time together and it looks like Evan has already got Jessica's seal of approval too.
It's always good to have the big sister on your side!
Jessica then uploaded another Instagram picture - this time of herself pouting next to daughter Maxwell, who turns two years old in May.
Maxwell can be seen giving a gorgeous smile to the camera and showcasing a set of sparkly blue eyes - aww!
Proud mum Jessica wrote beside the snap: "Love this lil lady more than anything!"
Six-month-old son Ace Knute and Jessica's fiancé Eric Johnson have not yet featured on her Instagram page, but we can imagine they will in the days to come, as the pop star gets to grips with her fun new foray into social media.
Are you a Jessica Simpson fan? Let us know below, as the best comment from across the website each week wins £50!
£2.49/month – that's all is costs for 4 issues of the REVEAL early edition. Gossip too good to wait for! Subscribe today!