Celtics head coach Doc Rivers, right, hugs his son, New Orleans Hornets shooting guard Austin Rivers. (AP)

In a game that was billed as the father-son contest, it was a twin brother who spoiled the night for the Celtics and put an end to their season-high six-game winning streak. Robin Lopez – the twin of Brooklyn’s Brook Lopez – scored 17 points while Al-Farouq Aminu added 16 points and eight rebounds to lead the Hornets to a 90-78 win over the Celtics Wednesday night at TD Garden. The Hornets pounded the Celtics on the glass, 48-33, and outscored them, 48-32, in the paint.

Austin Rivers, the son of Celtics head coach Doc Rivers, entered the game late in the first quarter, played 22 minutes and scored eight points. His highlight was drawing a foul on Paul Pierce with 0.4 seconds left in the third quarter. He made one of two free throws while the crowd booed.

Kevin Garnett had 15 points while Pierce had 12 points and 10 rebounds to lead the Celtics, who fell to 20-18 on the season. The Hornets, who were just 6-13 on the road coming in, improve to 13-26.

For the second straight night, the Celtics jumped out in front of an inferior opponent and appeared to be in for an easy night. But for a second straight night, the Celtics went mysteriously cold at the end of the first half and the beginning of the second half, allowing the Hornets back in the game.

The Celtics opened up a 21-10 lead in the first quarter as Brandon Bass had seven points in the opening period as the Celtics took a 25-20 into the second quarter. But the Celtics went cold in the second quarter and were dominated on the board by rookie Anthony Davis and the Aminu. With the Celtics leading 29-22, New Orleans went on a 16-3 run to take the lead. The Celtics responded to take the lead on a Pierce three with 28 seconds left in the half. But Ryan Anderson answered with his own 3-pointer to give the Hornets a 44-43 lead at the half.

The Celtics were ice cold to open the third, as New Orleans went on a 8-0 run to open the period to build a 52-43 lead. Pierce finally ended the drought when he hit an 11-foot turnaround with 8:16 left in the third. New Orleans, behind Aminu and Robin Lopez, built their lead to 12 twice, leading 61-49 when Jason Terry sparked a 7-0 run with a jumper and a three.

The Celtics, who trailed 68-63 after three, closed to within three in the fourth quarter but could get no closer and faded down the stretch.

The Celtics conclude their season-long five-game homestand on Friday when they host the Bulls at 7 p.m. at TD Garden. For more, visit the Celtics team page at weei.com/celtics.