You knew it was going to happen: Whitney Houston is HOT again. Too bad she can't enjoy it this time.

As of last night, Whitney's "Greatest Hits" album was the top seller on both iTunes and Amazon and it could end up in the Top 10 or 20 of the "Billboard" album chart, thanks to basically a single day of sales.

The official sales week ends on Sunday and there are estimates that the album may have sold around 50,000 copies from the time of Whitney's death until last night.

Meanwhile, Whitney's single "I Will Always Love You" hit #1 on iTunes and 41 of her songs were among the top 200 sellers on iTunes last night.