Alessandra Ambrosio, Fergie Nice T, Great A at Coachella

4/12/2015 7:20 AM PDT

Coachella hotness is not just for kids ... check out exhibits A and B.

EXHIBIT A:  Alessandra Ambrosio brought the girls to the concert Saturday and left her kids at home.  She's 34, and lookin' mighty fine.

EXHIBIT B:  Fergie showed off a nice piece of lace as she had fun in the sun.  Again, 40 looks amazing.

Peace out.