Blake Shelton and Gwen Stefani, who officially announced that they were dating last month, were spotted showing off some serious PDA during a romantic night out that including some kissing and butt-grabbing!

On Tuesday, the couple were seen enjoying a double-date at Casa Vega Mexican restaurant in Studio City, Los Angeles, Calif. and according to eyewitnesses, the two put on display their affection for each other.

"They were there with another couple and were waiting for valet for about five minutes. He kissed her twice and was pretty much grabbing her butt as he did," according to a source, E! reported.

The couple arrived at the eatery at about 8 p.m. and were there for almost an hour. They were reportedly in "high spirits" and cozying up next to each other on their double-date. "They were sitting at the bar and were very affectionate during dinner," the source added. "He had his arm around her, [and] they had margaritas. After dinner they left together and went to her house."

This isn't the first time the pair have indulged in PDA. On Monday night's episode of "The Voice," Stefani tweeted a picture of herself with Shelton gnawing at her shoulder. The couple reportedly even share kisses during commercial breaks, according to People.