October 27, 2011 03:00 PM

Diamonds may be a girl’s best friend, but Michelle Williams and her daughter, Matilda, have found a different kind of BFF: one with four legs.

The My Week with Marilyn star tells Ellen DeGeneres in Friday’s episode of The Ellen DeGeneres Show that Matilda, who turns 6 on Oct. 28, has fallen in love with the family’s new dog.

“We just got a puppy, so she’s very into the puppy,” Williams said.

As was DeGeneres, who presented Williams with a gift: a doghouse in the shape of a brownstone, the kind of housing found in Brooklyn, where Williams resides.

The “little, sort-of spaniel-type thing” has been named Lucky by Matilda, who was debating other monikers that her mother found questionable.

“Her first ideas were – they sounded like stripper names,” Williams said. “She wanted something like Crystal, Gem or Diamond. At first, I was going to be a controlling Mom … Then I was like, ‘You know what? Let her have it.’ But then she finally settled on Lucky, which made me feel very lucky.”

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