Pop duo AJ & Aly Michalka leave Anastasia Beverly Hills Salon in Los Angeles, Calif. on Wednesday.

Aly, 19 and AJ, 17, are growing up fast, shopping for some lingerie during their trip!

Both sisters are involved in the campaign to “Erase MS”. Check out the duo sporting their orange shirts!

40+ pictures of AJ & Aly Michalka on a shopping spree… More Here! »

Pop duo Aly Michalka and AJ Michalka model their Tommy Hilfiger-designed orange t-shirts to support the Nancy Davis Foundation for MS.

May is MS Awareness Month and the organization has partnered with a number of retailers to sell items in the signature MS orange - symbolizing hope. Proceeds will go towards educating the community and funding MS research.

Leather bracelets by Alexandra Knight and wallets/peace bracelets by Tommy Hilfiger are also being sold.

For more information, please visit EraseMS.org.