This is a working version .. change urls to your own needs
RewriteEngine On
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*naughtycelebs.co.uk*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*sexypicsandmovies.com*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*xnaughty.com*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*naughtysexpics.com*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*tgp2gallerypool.com*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*157.238.201.172*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*66.230.134.226*/ [NC]
RewriteRule .*[Jj][Pp][Gg]$|.*[Gg][Ii][Ff]$
http://www.megageil.nl/hotlinked351x60.gif [L,R]