It's Zac Morris aka Mark Paul Gosselaar from Saved by the Bell and NYPD Blue
(*blonde one on the left that's not 100%-totally-straight Mario Lopez)
Source: A friend's facebook. Identities changed to protect the guilty and because the Gosselin children are so much cuter than my loved ones.
And just because it's awesome, the Jessie Spano caffeine pill freakout.
*Edited for clarification. Star is from the 80s AND 90s.