Fallan, 25 from Kent became the centre of a real-life Mama Mia! story after she set out to trace her father, one of three candidates.
Like Sophie in the Abba hit musical, Fallan undertook her own detective work to find her real Dad.
"I always wondered who my Dad could be and my boyfriend, suggested I should try to find out."
Fallan turned to 192.com to find the contact details of the first person on her list.
"I put his name into Google and 192.com came up. The site was amazing, it had everything."
She added: "He was my mum's-ex boyfriend. I tracked him down and we did a DNA test. It wasn't him."
"Then his sister got back in touch to say she threw a party in 1984 and it could have been one of his friends from that night. She gave me his name, and I got in touch with him."
The man was Steve Phillips, 47, a builder living in the Midlands who already had two children.
Fallan added: "He lived in Dudley so we met at a service station on the M1. I could tell straight away, as his teeth are exactly like mine. He did a DNA swab in the loos there, we sent it away and it came back, and on Steve's birthday it came back positive."
"He was absolutely over the moon and I was so happy. We chatted a lot on the phone before meeting up, and now I feel like I'm part of the family.
The search over, Miss Kelly did not need to find the third candidate after reuniting with Steve in January 2011.
In June 2011, Fallan met the cast of the smash hit musical, Mamma Mia! at the Prince of Wales Theatre in the heart of London's West End.
Actor Will Tapley, who plays the character of Sam in Mamma Mia! said: "It's an amazing story. As anyone with kids will know, the bond between father and daughter is incredible. We're delighted for her."
Fallan's story attracted national press interest with Fallan being interviewed by the BBC Radio 5live! GMTV, Channel5, The Daily Mirror, The Evening Standard, new! and Cosmopolitan.