The Unsinkable Mommy Adler

S1 E13: Grace's (Debra Messing) visiting mom, Bobbi Adler (guest star Debbie Reynolds, Oscar nominee for 'The Unsinkable Molly Brown'), a would-be star whose propensity for breaking out into show tunes and impressions dismays her daughter - and delights Will (Eric McCormack), Jack (Sean Hayes) and Karen (Megan Mullally) - wreaks havoc by suggesting Will and Grace wed, despite their sexual differences. When Will winces at the fantasy of committing to anyone who needs to be the star of a relationship, Grace realizes she's more of a chip off the old block than she imagined.