How many books in the series sisterhood of travelling pants?

There are five books in the *Sisterhood of the Traveling Pants* series:

1. The Sisterhood of the Traveling Pants (2001)

2. The Second Summer of the Sisterhood (2003)

3. Girls in Pants: The Third Summer of the Sisterhood (2005)

4. Forever in Blue: The Fourth Summer of the Sisterhood (2007)

5. Sisterhood Everlasting (2011)