Justin Bieber's Mother's Day - gets booed

Justin Bieber with his mother Pattie Mallette (AP)

Justin Bieber watches the Los Angeles Clippers play the Oklahoma City Thunder in the first half of Game 4 of the Western Conference semifinal NBA basketball playoff series. (AP)

Justin Bieber takes pictures as he watches the Los Angeles Clippers play the Oklahoma City Thunder. (AP)

Justin Bieber greets boxer Floyd Mayweather Jr. (AP)

Justin Bieber greets actor Mark Wahlberg and his wife Rhea Durham. (AP)

Justin uploaded this photo of his mother. (Twitter)

NBA Commissioner Adam Silver, left, talks with Magic Johnson as they watch the Los Angeles Clippers play the Oklahoma City Thunder. (AP)

Billy Crystal celebrates as he watches the Los Angeles Clippers play the Oklahoma City Thunder. (AP)

Rihanna watches the Los Angeles Clippers play the Oklahoma City Thunder. (AP)

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