Rebecca Pearson is back and better than ever.On Thursday, March 25, Mandy Moore took to Instagram to announce her long-awaited return to the set of This Is Us, which comes after the actress gave birth late last month.“Mom is BACK at work!!!” she wrote under a video of herself sitting in a hair styling chair. In the following Story, she elaborated on the excitement, posting a selfie and writing, “Beck is back. So grateful to be able to ease back into this job I love so much (and to be able to