Whitney Houston has again checked into a drug treatment center in a desperate bid to kick her tragic addiction to crack cocaine, The ENQUIRER has learned.

Shockingly, her hubby Bobby Brown was kept in the dark about Whitney’s whereabouts for several days.

According to his sister Tina Brown, Bobby returned to his home in Alpharetta, Ga., on April 14, after a performance tour and found Whitney was missing.

“At first he thought she was just off on another drug binge,” Tina told The ENQUIRER.

“It took a few days for him to find out from Whitney’s family that they had talked her into going into rehab — and a few more days to get an answer about which treatment center she was in. All Bobby told me is that she is in treatment, in a secluded place.”

Bobby and Whitney’s daughter, 13-year-old Bobbi Kristina, is being cared for by Whitney’s brother Gary Houston and his wife Pat, who live in the Alpharetta area, said Tina.

Whitney’s spokesperson Nancy Seltzer declined to comment when asked if the troubled superstar had entered a treatment center. Her latest attempt to get herself clean comes in the wake of The ENQUIRER’s exclusive series of interviews with Tina, a recovering drug addict who was Whitney’s drug buddy for many months.

Tina detailed how 42-year-old Whitney has hit rock bottom, spending days doing drugs locked in her bathroom or hanging out in dangerous crack dens near Atlanta. Stunning photos that Tina provided of Whitney’s bathroom, following one drug binge, showed how low she has sunk with crack.

Tina, a 42-year-old mom of six, is praying that Whitney can finally beat her addiction.

“I hope this time it works,” she said. “She can still come back and be the star she was, the singer the world adored. I pray to God she’ll get herself clean for good.”

For more exclusive details, check out our May 1 issue, available on newsstands later this week.