Obviously I don't know what you've already read, haha, but these are some of my faves. I only do lighthearted fun books.
Sophie Kinsella's
Shopholic series are my favorite books ever. I've read the series more times than I can count.
I also really loved her
Twenties Girl book.
Meg Cabot has some great books too. I especially like the
Heather Wells Mysteries.
The Queen of Babble series is fun too.
I Do but I Don't and
I Did but I Wouldn't Now by Cara Lockwood are fun too.
I just finished reading
Seattle Girl and
Sparks Fly by Lucy Kevin. There's a 3rd one called Falling Fast which I haven't read yet but Amazon had a Kindle 3-pack of all 3 books for $3.99. I liked both books I've read so far.
HTH!