TaeTiSeo, KARA, A Pink, 4minute, and SISTAR showed that they're beautiful inside-and-out as they participated in the worthy cause, the 'Angels' Letter' project.

The 'Angels' Letter' project was started by photographer Jo Se Hyun back in 2003 as part of a campaign to bring awareness to adoption by taking the 100th day photos of orphans with celebrities. The 11th annual 'Angels' Letter' project will be displayed at Insa Art Center in Gwanghundong, Seoul for one week starting on the 18th with the theme of 'innocence'.

Jo Se Hyun shared, "I'd like to thank the idol stars and staff who took precious time from their schedules to partake in the filming and exhibit once again."

Check out the girl group edition of photos released below!