It was a lucky day for lonely hearts everywhere on January 25 when off-Broadway's Miss Abigail’s Guide to Dating, Mating and Marriage celebrated its 100th performance! Eve Plumb and Manuel Herrera, who star as love guru Miss A and her faithful sidekick Paco, enjoyed some well-earned cake to commemorate this heart-warming milestone at the Downstairs Lounge at Sofia's. Click through to check out the festivities, including a very special TV alum guest!