"I think winning here is very special for her and I'm glad she finally got her first Slam", said the American. I always said that if I am going to win one, I want it to be here. She saved five match points on her way to the final, only to fall just short against Caroline Wozniacki, who won her first major title.
It will be Halep's second consecutive Grand Slam final and her fourth overall attempt to win her first title in a major.
Take a look at some of the best tweets after Halep's hard-earned victory.
By the end of the match the unforced errors kept creeping into Stephens' game and at times she looked totally lost as she tried to work out what was happening.
And Courier says Halep deserved to win in that fashion.More news: Prince Harry, Meghan Markle Attend Queen’s 92nd Birth Celebration
There, Halep will be searching for a first Roland Garros win after previously losing there in 2014 and 2017. "In tennis, you never know, so I will stay chill".
Stephens spoke about Halep's rally after the first set.
Showing remarkable nerves given that this was only her second Grand Slam final appearance, Stephens consistently held her serve to take the first set 6-3. As Stephen's level dropped, Halep demonstrated her mental strength, flipping the script from last year's final, when she led by a set and a break against Ostapenko before collapsing.
Thursday's action at Roland Garros saw Sloane Stephens impressively account for her American counterpart, Madison Keys, in straight sets, but arguably the standout display was from Simona Halep, as she tore through Garbine Muguruza in a brutal opening set, before coming through at the end of the second for a 2-0 victory.
She persevered through a battle to hold serve and go up 5-4.
The 2008 Roland Garros girls' singles champion learnt a harsh lesson past year against Jelena Ostapenko, when she played not to lose from 3-0 up in the second set.More news: EA Play 2018's Layout Holds a Secret Surprise
The loss of the second set clearly had a negative effect of Stephens, who began to show signs of frustration on court. "There's not as much, "Come ons" and things like that".
She needed only 70 minutes to eliminate Sharapova and dominated her with superb returning, breaking the former No. 1 a half-dozen times. "I can only imagine how she must be feeling".
The match was all but ended as Halep clinched the double break in game four after some magnificent defending in one of the points of the match.
She fought back from a set down against Maria Sharapova in 2014 only to lose a tight decider, before seeing a set and 3-0 lead disappear in a barrage of Jelena Ostapenko winners past year.
Nearly exactly 12 months ago, Simona Halep was on the brink of her first major title. Stephens is one of the best movers on tour, and while Halep has started to become more aggressive, she certainly can't hit many winners against the American and will have to rely on mistakes from her opponent.More news: Tropical Storm Aletta grows stronger in Pacific