Brian Littrell and Leighanne Wallace commemorated two decades of their marriage on Sept. 2. The couple completed 20 years together in wedlock and the Backstreet Boys' fame star opened up in an interview to share the secret of their marriage.

The couple celebrated the big day of their anniversary at their home located in Atlanta with their son, Baylee who is 17-year-old. The pair spoke about how they have managed to maintain a bond between them for such a long time.

The couple first came across each other on the sets of a music video shot for Backstreet Boys' popular song, As Long as You Love Me in 1997. The 45-year-old singer and songwriter said that he remembers every single moment of their first meeting and still cherishes that time.

The multi-talented star admitted that to date, he can't get those memories out of his mind throughout the relationship. Littrell even remembers the exact time when he saw Wallace's picture for the first time, it was 4:15 early morning.

"It was just kind of a smack-in-the-face whirlwind of life-changing events that happened right there when we met. I had a chance to see Leighanne's headshot on the way there, it was about 4:15 in the morning, I was in a van, headed to the shoot, and I saw her photo at the bottom of the stack and it said 'Leighanne Wallace,' and I was like, 'Wow, I have to remember that name," he explained.

The singer recalled that the time they met one another was perfect because none of them wanted to get into a relationship or seeking love. In fact, both were focused on their respective careers and that turned out to be amazing for both of them.

Littrell said that it was a blessing that both of them agreed for this "joint venture". He remembers the first time when Wallace turned him down as he asked her to grab drinks with him but she already had plans for the evening.

The 51-year-old said at that time, she is free tomorrow night but again Littrell tried to play hard and reminded that he was asking her out for "tonight". The Megalodon star shoots back at the singer and reminded him that she asked for tomorrow. The singer said that it was unexpected for him but the attraction was from both sides. However, they went on to date each other and eventually got married after a couple of years.