You're talking my language
If you like Marian Keyes, you'll love Catherine Alliott. She's an english author who writes similar books, really LOL funny... Marian's been quoted as saying Catherine's perhaps her favourite author.
Ditto Cathy Kelly (irish author like Marian). Light fluffy womanly fun, less risque than Marian or Catherine Alliott (not that they're racy exactly lol).
Penny Vincenzi is great (english author).... she writes big sweeping family sagas full of betrayal & rags/riches stuff, good modern escapism.
I love Julie Ellis (american author, she's dead now). She's written a tonne of chick lit, lots of older-style drama.... war romances & southern fight-daddy-for-the-plantation type gooey stuff, delish!
Sophie Kinsella (english author) writes modern light fluffy girly stuff (ie, the Shopaholic series)
There's lots more if you want more reccs!! but there's gotta be something there you'd like