Conversation so far:
Was atomic kitten a musical band?
In April 2003, the album Atomic Kitten was released in the United States, which consisted of tracks from their first two albums.
how  many members were in the band?
CANNOTANSWER.
Why did Hamilton leave the group?
The Big Reunion that Hamilton had quit the group under the pressure of being a new mom and touring.
is ladies night the name of a song or an album that they did?
In early 2004, a tour to support the Ladies Night album.
Where did they tour?
CANNOTANSWER.

Question: did they get back together after the break?
Self-contained rewrite: did the Kittens get back together after the break.