The younger sister of Jessica Simpson was pictured leaving an LA gym on Tuesday, 17 March alongside her actor husband Evan Ross.
Ashlee announced in December that she was pregnant with her second child, four months after marrying Diana Ross' son Evan at the singer's estate in Connecticut.
She's also mum to son Bronx, six, from her marriage to Pete Wentz.
Ashlee and Evan have already found out they are expecting a baby girl, with Ashlee saying recently she wanted to get a start on decorating the nursery.
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