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Ivanka Trump

( Stephen Lovekin / Getty Images )

"Celebrity Apprentice" mentor Ivanka Trump, 31, and husband Jared Kushner are expecting their second child.

"Jared and I are so excited that Arabella will become a big sister this fall. Thanks for all your good wishes!" she tweeted April 11.

The couple welcomed Arabella Rose, their first daughter, in July 2011. She and Kushner, the chairman of Observer Media Group, married in 2009.

MORE: Ivanka Trump confirms she's pregnant with her second child