The plural for for the noun celebrity is celebrities.
The plural possessive form is celebrities'.
example: An army of photographers were on hand for the celebrities' arrivals.
The plural possessive form of actress is actresses'.
The possessive form of the plural noun actress is actresses'.
The possessive form of the plural noun sopranos is sopranos'.Example: The sopranos' rehearsal is scheduled for two.
There is no singular possessive of "actresses". The word itself is plural. The singular possessive of actress, however is "actress's."
If you take the plural away.... Mick Jagger.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The correct form is "its" for the possessive form in the plural. "Its" is used for both the singular and plural possessive forms, without an apostrophe.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is relatives. The plural possessive is relatives'.
The plural is stations. The plural possessive is stations'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural of rose is roses. The plural possessive is roses'.
The plural form is homes; the plural possessive is homes'.
The singular possessive is biker's; the plural possessive is bikers'.