Somehow, it's been 18 years since How I Met Your Mother premiered on September 19, 2005. To celebrate the anniversary, we're looking back at the main cast (and several guest and recurring actors!) on their earliest red carpets vs. now:

1.Josh Radnor (Ted Mosby) on his first red carpet in 2005:

Josh Radnor on his most recent red carpet:

2.Cobie Smulders (Robin Scherbatsky) on her first red carpet in 2002:

Cobie Smulders on her most recent red carpet:

3.Neil Patrick Harris (Barney Stinson) on his first red carpet in 1989:

Neil Patrick Harris on his most recent red carpet:

4.Alyson Hannigan (Lily Aldrin) on her first red carpet in 1989:

Alyson Hannigan on her most recent red carpet:

5.Jason Segel (Marshall Eriksen) on his first red carpet in 1999:

Jason Segel on his most recent red carpet:

6.Bob Saget (Future Ted) on his first red carpet in 1988:

Bob Saget on his most recent red carpet:

7.Lyndsy Fonseca (Daughter) on her first red carpet in 2002:

Lyndsy Fonseca on her most recent red carpet:

8.David Henrie (Son) on his first red carpet in 2002:

David Henrie on his most recent red carpet:

9.Cristin Milioti (Tracy aka the mother) on her first red carpet in 2007:

Cristin Milioti on her most recent red carpet:

10.Sarah Chalke (Stella) on her first red carpet in 1994:

Sarah Chalke on her most recent red carpet:

11.Jennifer Morrison (Zoey) on her first red carpet in 2000:

Jennifer Morrison on her most recent red carpet:

12.Marshall Manesh (Ranjit) on his first red carpet in 2007:

Marshall Manesh on his most recent red carpet:

13.Wayne Brady (James) on his first red carpet in 2000:

Wayne Brady on his most recent red carpet:

14.Alexis Denisof (Sandy Rivers) on his first red carpet in 2001:

Alexis Denisof on his most recent red carpet:

15.Ashley Williams (Victoria) on her first red carpet in 2002:

Ashley Williams on her most recent red carpet:

16.Charlene Amoia (Wendy the Waitress) on her first red carpet in 2002:

Charlene Amoia on her most recent red carpet: