The 26-year-old was one of several guests at the pregnant star's baby shower thrown earlier this month.
Aguilera received lots of blue-colored gifts--sparking speculation the sex of the unborn child is male.
And now Milian has confirmed the rumors.
She tells UsMagazine.com, "Her son is going to be pretty lucky because his mom... She's just awesome! She is going to be a cool mom."
The carnival-themed bash was the first of three baby showers to be held at the mother-to-be's Beverly Hills home in California before she is due to give birth in the new year.
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