Mama Mia!

5/14/2008 4:55 PM PDT BY TMZ STAFF
The 63-year-old resurfaced at LAX on Tuesday, looking groovy.

Michelle -- who is the last surviving member of the legendary band -- is also Chynna Phillips' mother.

Actress Sharon Tate and three other of Michelle's friends were murdered by Charles Manson's cult in 1969.