Lynne Spears -- Back for Britney ... and Starbucks

2/29/2008 9:41 PM PST
Lynne Spears is back in L.A. -- as she continues to rack up frequent flier miles by splitting time between troubled Britney in California and knocked-up Jamie Lynn in Louisiana.

Brit's mom was mum when TMZ caught up with her at (where else?) Starbucks in Studio City.