Emmy Rossum shares her keys to feeling fab

Everyone has those wake-up-feeling-blah days.

Emmy Rossum’s secret for combating them?

“I usually drink lemon and cayenne — it’s not a cleanse. It’ll just wake you up and reset you,” the “Shameless” star told us at DKNY’s 25th anniversary party Monday night at 23 Wall Street.

The actress’ other keys to looking great include taking classes at Physique 57 and SoulCycle, and “just happiness and clean living, clean eating.”

Also at DKNY’s bash were Karlie Kloss, Joan Smalls and songstress Rita Ora, who performed.