Tom Bergeron -- Cracks Erin Andrews Stalking Joke

Tom Bergeron hit a little too close to home Monday night on "Dancing With the Stars" ... when he made a stalking joke about Erin Andrews ... who very famously dealt with a stalker of her own.

Andrews was debriefing Alfonso Ribeiro when she began gushing over Will Smith ... who went on a social media campaign supporting his former "Fresh Prince of Bel Air" co-star.

After Andrews repeatedly invited Will to show up to a taping, Bergeron followed it up by saying Will could do worse than having Erin as a stalker ... insinuating it's ok for hot chicks to stalk guys.