THEN AND NOW: Here's how the longest celebrity couples evolved over the years

• There are plenty of celebrity couples that have lasted over 20 years. 
• Even today, they look just as happy as ever.
• From Will Smith and Jada Pinkett Smith, who got married in 1997, to David and Victoria Beckham, who wed in 1999, these celebrity couples glow as they grow together. 

One of the benefits of a long-term relationship is that you get to grow old together. Long-lasting celebrity couples also do it in the public eye. 

Many of these famous couples — from Tim McGraw and Faith Hill to Ellen DeGeneres and Portia de Rossi— have gone through various transformations over their decades-spanning relationships. 

From then to now, here's how these long-lasting celebrity couples have grown over time. 

Ellen DeGeneres and Portia de Rossi have been together for 14 years.

Comedian Ellen DeGeneres met actress Portia de Rossi in 2004 and said "I do" in 2008. After 14 years together, the pair is still going strong. 

Sacha Baron Cohen and Isla Fisher have been married for eight years but have been together for 16.

Actors Sacha Baron Cohen and Isla Fisher first met in 2002 at a party in Australia. The pair didn't tie the knot, though, until 2010 at a private wedding which only six people attended. 

Sarah Michelle Gellar and Freddie Prinze Jr. have been together for 18 years.

While filming "I Know What You Did Last Summer" in 1997, actors Sarah Michelle Gellar and Freddie Prinze Jr. met, but they didn't start dating until 2000. Today, they are married and have two children.