Lookin’ good, Ciara ! The 28-year-old singer is showing off her post-baby body in the latest ads for Calvin Klein underwear, and we’ve got to admit: Ciara doesn’t look good for having recently had a baby, she just looks good. Period. The pop star gave birth to son Future Zahir Wilburn this past May, and it didn’t take long for her to slip into her Calvins. Ciara tells E! News exclusively, “I feel so proud to say that at four months after delivering a 9 pound, 10 ounce. baby, I can finally rock my Calvins!” And while it’s hard to believe that Ciara was pregnant just this past spring, she did reveal to us exclusively back in August that she was working diligently with her trainer Gunnar Peterson. She also revealed that she was focused on eating healthy and balanced meals every day.