"Round two. Here we go!! :)" Wilkinson tweeted on Thursday.
After the Kendra On Top and former The Girls Next Door star received a series of congratulatory messages from her Twitter followers, Wilkinson replied, "Thank you for all your love and support. Really appreciate it!!! :D."
"She and Hank have been planning a second baby for a while and they are very excited," a source told Us Weekly.
Us reported at the time the former Splash contestant was eight weeks pregnant.
Wilkinson, who married Baskett, a 31-year-old former NFL player, in June 2009, welcomed their first child in December 2009. The couple's three-year-old son is named Hank Baskett Junior.
Wilkinson, a 28-year-old former Playboy Playmate, told People in September she had decided to "hold off" on getting pregnant although she had originally hoped her two kids would be similar in age.
Wilkinson decided to quitSplash, ABC's reality diving competition, during an early April broadcast due to her overwhelming fear of heights.
Kendra On Top's second season premiered on WE tv on September 13.
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