The reality stars dated back in 2011 before splitting, then briefly rekindled their romance on two separate occasions before it fizzled out.
Lauren's also romanced co-stars Lewis Bloor, Mario Falcone and Tom Pearce but, according to her, those were just casual relationships compared to Kirk.
She said: "I've only had one love on the show and that was Kirk. I've dated other guys but it's never been anything serious."
Lauren also said she was gutted when she split with Kirk because it meant saying goodbye to dog Bozo who she bought for Kirk's birthday.
"I was obsessed with that dog and I was sad when we broke up as it meant I didn't get to see him that much."
Ahead of the new series of TOWIE kicking off in Marbs, Lauren also spoke about ex-boyfriend Lewis Bloor.
She said she'd never been so angry as she was during her fight with him in Ibiza: "I've never been spoken to with such disrespect; to be cheated on and then insulted was a bit raw for me."
Lauren also said she did regret the Lewis argument: "I'm usually quite a cool character but I have my limits and he pushed me over that limit. I let myself down a bit with the things I said but I guess we're only human."
TOWIE stars Sunday, 14 June at 10pm on ITVBe.
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