Although she hasn't opened up about exactly what she's going through, she did explain that Jake Gyllehnaal, bonafide babe.com was helping her through the sadness.
Rebel took to Instagram to share a photo of a sketch that Jake had drawn for her on the night that she was attending his Broadway play, Sunday In The Park With George.
"Well this really cheered me up after a crap couple of days and was very moving," she wrote. "Thanks Jake Gyllenhaal, @annaleigh_ashford and the amazing cast of Sunday In The Park With George. I will treasure this sketch x".
Sometimes all it takes it drawing a cute pic for someone to really make their day. Refer to Clay from 13 Reasons Why giving Hannah a bunny drawing each day in her compliment box...
Rebel is currently filming the third installment in the Pitch Perfect franchise, so hopefully that's not getting her down...