A woman allegedly broke into actor Robert De Niro's Upper East Side townhouse early Monday morning and began snatching up Christmas presents from under his tree, according to police.Shanice Aviles, 30, was arrested on burglary charges after she was spotted entering De Niro's home at 2:45 a.m., police said.Police were following Aviles because she was wanted in connection with six other burglaries.Aviles was arrested for seven burglaries in the 19th Precinct on the Upper East Side alone between Nov. 25 and Dec. 8.When she did not come out, police entered the home and saw her taking presents from under the Christmas tree and putting them into a bag."