The names of four famous people have been scrambled. They are: an American president, a Hollywood actor, a singer, and a tabloid celebrity (though not necessarily in that order). The lengths of the first and last names are given. Who are they?

1) I paint a vocal tour (7, 9)
2) less gray nuts (7, 5)
3) no split hair (5, 6)
4) old west action (5, 8)