Simpson on Tuesday tweeted a photo of her baby daughter Maxwell playing in the sand, the words "Big Sis" spelled out.
The 32-year-old old singer and personality has been rumored to be expecting again. The tweet appears to confirm the rumors.
"Merry Christmas from my family to yours" is the picture's caption. Simpson used a tweet on Halloween in 2011 to announce she was pregnant with Maxwell. She is engaged to Eric Johnson and gave birth to Maxwell in May.
One possible complication regarding her pregnancy: She is a spokeswoman for Weight Watchers.
