"Survivor" Host Gets Married!

"Survivor" host JEFF PROBST is getting down with Zack Morris' sloppy seconds.

On Monday, Jeff married 40-year-old Lisa Ann Russell.  She's the ex-wife of former "Saved by the Bell" superstar MARK-PAUL GOSSELAAR.  Lisa and Mark-Paul have two kids together.

Probst . . . who's 50 . . . was married to a psychotherapist named Shelley Wright for five years.  They divorced in 2001.