The Strictly Come Dancing star, 27, became infamous as a sweet-talking lothario on TOWIE, but has been a changed man since falling in love with actress Michelle.
In an interview with The Sun, Mark admits he's transformed from a "party boy" into a "man".
He says: "I was only 23 when I did TOWIE and a bit of a party boy. I was still growing up. I would sleep in late and go out at night.
"But I always wanted to grow up and marry a woman that I love and respect then have kids.
"That chapter of my life is beginning. I guess I'm a man now."
Mark and his stunning fiancée Michelle are set to marry in 2015 and bought a house together in Essex earlier this year.
He says of the transition: ""It's been so great living together, but then Strictly started and everything went crazy. We've been taken away from each other a little bit.
"But Strictly is finishing at Christmas, as is the TV drama she's working on, so we're going to take January off, relax and get ready for next year's wedding."
Mark was once engaged to his TOWIE co-star Lauren Goodger, but the relationship was left in tatters after his notorious womanising.
He also dated fellow castmates Lucy Mecklenburgh and Sam Faiers... Leaving a string of broken hearts in his wake.
But it looks like the leopard has finally changed his spots.
And he's even perfecting his moves on SCD for their wedding dance - he's definitely smitten!
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