The Dancing With the Stars Season 17 official casting announcement this morning (September 4) on Good Morning America, and this cast is definitely an all-star lineup.

It looks like Tristan MacManus will be helping another contestant battling an illness this season, though Valerie Harper’s brain cancer is much more tragic than Dorothy Hamill’s Season 16 health problems. Though the rumored DWTS star is in remission, it doesn’t mean that she has an easy road ahead. However, she is taking it in stride — and reportedly already rehearsing!

TMZ says that she is “rehearsing like a champ and getting no special breaks” ahead of the September 16 premiere. Tristan is a caring and talented partner, so we’re sure they can make it far together.

Wetpaint Entertainment broke the news that Sasha Farber will move up from the troupe and dance with former Jersey Shore guidette Snooki, and a few pros have “revealed” tidbits about their partners on Instagram. As for the others, check out our full list of stars and their professional partners!

Tune in for the Season 17 premiere on Monday, September 16!