The 48-year-old singer and actress shared a photo of 9-year-old daughter Emme and son Max from their first day back to school Thursday.

“So proud of my babies… #notbabiesanymore #4thgrade #love,” she captioned the picture on Instagram.
The snapshot shows Emme and Max smiling as they pose in their school uniforms. Both kids wore white shirts and a blazer featuring their school’s crest, with Emme in a pleated skirt and Max in khaki slacks.

Lopez shares her twins with ex-husband Marc Anthony, from whom she split in 2011 after seven years of marriage. She has since started dating Alex Rodriguez, and spent the weekend celebrating Warren Buffett’s birthday with the former New York Yankees player.