Well now you can!!
Avatars made so far is Harrison Ford a.k.a Indiana jones,Miley cyrus a.k.a Hannah Montana, Aaliyah ( first of her in secondlife),Chris brown (as you all know chris brown and Riahanna are dating so why not pair them up in world
.....and pussycat doll lead singer nicole and also Victoria beckham avatars. My Store just opened 10/9/09 and group just opend too!! ( you may join group Apple's Celebrity Designs to get freebies and notices on new celebrities being added). I take request of celebrities thats arnt in secondlife. (I also do custom skins and clothing.. if you want your avatar to look like your real life self and/or neko, vampire or any kind of skin really. HIT ME UP IN WORLD! (Apple Jansma)
But anyway check them out at my mall called APPLEGATE MALL here
http://slurl.com/secondlife/Selmers%20World/155/128/25
or on my slexchange site here
http://xstreetsl.com/modules.php?name=Marketplace&MerchantID=117920