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London - The socialite and businesswoman revealed her happy news today by tweeting a picture of her baby shower invites, which are a gold rattle inside a pink box.
She also thanked her sister, Petra, for her part in designing them, writing: "The most beautiful baby shower invites I have ever seen, I have the world's best sister."
Seven months pregnant Tamara, 29, has previously said she wants her first child with husband Jay Rutland to be as close as possible in age to Petra's daughter, Lavinia, who is currently 11-months old.
She said: "I want them to be as close as me and my sister. And I would just love to have a little girl who would be super close to Lavinia.
"There's only going to be a year between my baby and Lavinia so that would be amazing. Lavinia is the cutest little pooch in the world."
Tamara has also said her sister has been giving her lots of help preparing for the birth.
She said: "Having her go through it so recently, I'm getting loads of tips from her, she's really helping me out and giving me loads of advice, which is really nice." - Bang Showbiz