In the pic, Lopez, 46, shows off her incredible physique in a white Moeva swimsuit, which features a very plunging neckline and gold belt. She completed the ultra-fierce look with a pair of Fendi cat-eye sunglasses and hoop earrings, while keeping her hair pulled back into a tight top knot.
"By the pool for my girlie Tera's Bday!!" she captioned it.
Looks like Perez and Lopez were able to take some time off from their crazy-busy schedule to celebrate in style -- just check out that sparkly gold cake!
The girls looked equally as glam on Sunday afternoon when the two stepped out to the Carnival Del Sol pool party at Drai's Beach Club. The American Idol judge donned a teeny string bikini top, white shorts and an oversized sunhat, while her pal kept it classic in an all-black bikini and strappy sandals.
Perez took to her own Instagram account to share a pic, simply captioning it, "Love this chick."