<Li> Jaime Pressly as Pam, the Bingham's initial surrogate who they soon soured on due to her sleeping with Russell . </Li> <Li> Heather Locklear as Barbara, Audrey's sister, on whom Russell has a crush . </Li> <Li> Joan Collins as Bunny Dunbar, Russell's wealthy, superficial mother . </Li> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> 7 </Td> <Td> February 5, 2007 (2007 - 02 - 05) </Td> <Td> March 19, 2007 (2007 - 03 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> 15 </Td> <Td> September 24, 2007 (2007 - 09 - 24) </Td> <Td> May 19, 2008 (2008 - 05 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> 13 </Td> <Td> March 2, 2009 (2009 - 03 - 02) </Td> <Td> May 18, 2009 (2009 - 05 - 18) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> 13 </Td> <Td> March 1, 2010 (2010 - 03 - 01) </Td> <Td> May 24, 2010 (2010 - 05 - 24) </Td> </Tr> <Tr> <Td> </Td> <Td> 5 </Td> <Td> 24 </Td> <Td> September 20, 2010 (2010 - 09 - 20) </Td> <Td> May 19, 2011 (2011 - 05 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td> 6 </Td> <Td> 15 </Td> <Td> October 20, 2011 (2011 - 10 - 20) </Td> <Td> May 17, 2012 (2012 - 05 - 17) </Td> </Tr> <Tr> <Td> </Td> <Td> 7 </Td> <Td> 13 </Td> <Td> February 4, 2013 (2013 - 02 - 04) </Td> <Td> May 20, 2013 (2013 - 05 - 20) </Td> </Tr> </Table>

Who plays mrs dunbar on rules of engagement