Wagner – who hadn't seen Locklear since she left Los Angeles for the facility on June 19 – spent several hours with her last weekend, sources say. On Sunday, the two had lunch together in the facility's dining area.
"He looked like he was taking care of her," says an observer. "It was very sweet."
Dressed down in sweats and a T-shirt, Locklear, 46, "looked exhausted," says the observer. "Even with no makeup she was beautiful, but she seemed tired, pale and very skinny."
Wagner, 48, chatted to Locklear, leaned in to kiss her on the forehead, and at one point during the otherwise quiet meal, says the observer, "He made her laugh."
Far-Reaching SupportLocklear checked herself in to the facility for an in-depth evaluation on the suggestion of a doctor. She had been taking medication for anxiety and depression since after her 2006 split with Richie Sambora, with whom she has a daughter, 10-year-old Ava.
Among her biggest supporters since she entered treatment: her beau of more than a year, Wagner, as well as her ex.
"Heather has a few really close, trustworthy friends who are very protective and are pulling for her," says the pal. "What she's doing is so brave. Are some days tougher than others? Yes. But it will all be worth it when she's back to being able to really feel the joy in every day."
There is no timeframe on Locklear's stay at the treatment center. "Once she's feeling better," says the friend, "She'll come home."