Grace's

visiting

mom,

Bobbi

Adler,

a

would-be

star

whose

propensity

for

breaking

out

into

show

tunes

and

impressions

dismays

her

daughter

-

and

delights

Will,

Jack

and

Karen

-

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.