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Whatever makes her comfortable -- we think she looks gorgeous either way!

Kristin Cavallari was spotted arriving at the Montage Hotel in Beverly Hills this morning, and later in the day the pregnant starlet swapped her short purple frock and flats for a pair of floral pants, Louboutins and a tight black top.

Of course, with her growing baby bump, she's going to want to invest in some maternity jeans if she hasn't already!