Sliwa: LiLo & RiRi Need Guardian Angels

3/17/2009 2:10 PM PDT BY TMZ STAFF
... as in, protection courtesy of the red beret brigade fronted by Curtis Sliwa.

Sliwa and his unarmed crime fighting group "Guardian Angels" trolled Venice for trouble last night.

As some straight-off-the-boat Irish cornered Curt for autographs, he worried out loud how both Lindsay Lohan and Rihanna need help ... stat.