Conversation so far:
What was their first solo act?
In January 2004, Hamilton announced she wanted to take a hiatus from the group.
What did she need to take the hiatus?
devote more time to her young son.
Did she come back for an appearance?
reunited on Valentine's Day 2005 to release the charity single "Cradle 2005".
Was Cradle a hit?
Cradle 2005" peaked at number ten.
Did she have another appearance?
The group reunited in December 2006 for The Nokia New Year's Eve Music Festival, performing in Hong Kong on 31 December 2006.

Question: Who had a solo project?
Self-contained rewrite: Who in the Atomic Kitten group also had a solo project?