Celebrities gathered at The Hollywood Museum on Dec. 8 to sign ornaments and trim the traditional tree in the museum’s lobby. Alison Arngrim, known for her role as Nellie Oleson on “Little House on the Prairie” was among the celebraties to add her hand-decorated ornament to the tree. Other participating celebrities included Alice Amter, Ann Walker, Darby Hinton, Del Shores, Diane Lansleen, Hank Garrett, Jean Kasem, Jerry Mathers, Kim Karath, Lee Purcell, Rico Anderson and Steve Wishnoff, among others. The tree can be seen throughout the holiday season. The museum is open from 10 a.m. to 5 p.m. Wednesday through Sunday. For information, visit thehollywoodmuseum.com or call (323)464-7776.