At this point, Jennifer Lopez has an honorary doctorate in ultra-luxurious outfit changes and high-low combinations. She showed off her expertise in unexpected outfit combinations again yesterday, mixing a blueberry-colored sweat suit with her trusty Birkin bag.

While running errands on Tuesday, April 16, the "Let's Get Loud" singer was photographed wearing what appears to be her favorite color for spring, cobalt blue. (She went for a casual look with an oversized crewneck sweatshirt and matching drawstring pants sweatshirt set by Frankies Bikinis. The Lopez items are sold out, but other colors are still available.

She also wore a pair of R13 chunky lace-up boots that mimic the classic Timberland silhouette with larger-than-life sunglasses. She wore large silver hoop earrings and a black Hermes Birkin tote bag adorned with gold hardware.

Lopez's latest outing, This Is Me. . now star, followed another high-low moment for the star. Early yesterday morning, she left her workout in toe-tapping green and trendy chunky sneakers. Her athleisure look for the afternoon consisted of army green leggings, a fluffy sage jacket, and On Cloudtilt x Loewe sneakers. Accessories, of course, included her trusty Hermes Himalayan croc birkin bag.

The "On The Floor" singer also seems to be sticking to a particular color palette this season. Lately, she has been favoring all shades of blue. Take, for example, her brunch look. Last week, Lopez went out with husband Ben Affleck and layered on various shades of blue. Her outfit that day consisted of an oversized dark blue coat, a navy Intimissimi long-sleeved turtleneck, Acne Studios wide-leg jeans, and cerulean blue heels.

Lopez's casual off-duty look perhaps hinted at the theme of her first tour in five years. (At least as far as apparel is concerned.)

It seems unlikely that Lopez will give up dressing high-low (or the color blue) any time soon. In the meantime, shop her casual sweatshirts below, without the $80,000 Birkin bag.