According to IMDB, she didn't. During much of Magnum, P. I.'s run (1980-1988), she was busy on Remington Steele (1983-1987) playing Mildred Krebs.
No
Yes
It is rumored that she does have a girlfriend, but Roberts has been very private about her personal life.
No.
yes
Yes, they are sisters who appear to be not particularly close and they seldom, if ever, refer to one another in the media
The .357 Magnum was the first gun to use the term magnum.
Yes. Julie Roberts guest-starred in the highest rated Friends episode ever: the second part of "The One After the Super Bowl" which aired on January 28, 1996.
No.
No
Doris Day is often at her bed and breakfast in Caramel, California
No
Doris isn't play Annie Oakley, Betty Hutton does. But Doris recorded all songs from the movie.
no
no
No, she did not ever.
no