Carefree Jennifer Garner Lets Loose With A TikTok Dance After Ex Ben Affleck's Engagement News: Watch!

It's clear that Ben Affleck and Jennifer Lopez's engagement news isn't bothering his ex-wife Jennifer Garner! Just a few days after the pair revealed they were engaged for the second time, the Alias star uploaded a fun, upbeat TikTok that showed her and ballet dancer Tiler Peck showing off some coordinated choreography.

In the cute 20-second clip, the 49-year-old actress is dressed in a tee, leggings and sneakers as she grooves with the pro to "Better When I'm Dancin'" by Meghan Trainor. In the last three seconds of the video, the duo do some freestyle moves.

"@Tiler Peck , you make the sun shine bright. 🤩🌞♥️," the mom-of-three captioned the post, which caught the attention of Trainor herself, who commented, "I’m screaming. And crying. Love you girls !" Replied Garner, "We looooove you ♥️."

Pal Gwyneth Paltrow called the video — which was also uploaded to Instagram — "So cute!" and Rita Wilson wrote, "You make me so happy!!!"

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Even before the Adam's Project star shared the video, insiders spilled that she was happy for Affleck, 49, who she shares daughters Violet, 16, and Seraphina, 13, as well as son Samuel, 10, with.

Once source told Hollywood Life that Garner "acted completely favorable to it and even congratulated them" on the news.

"Jennifer [Garner] and Ben have been broken up for a very long time and there is no reason whatsoever that she would be upset about this," insister the source. "She is happy if he is sober and he is doing well, both of which he is and both of which are of utmost importance to JLo."

"The two women have respect for each other as mothers and as individuals," the insider continued. "They are on speaking terms and have had numerous talks. They know that they are going to be a part of each other’s families for life through this marriage."

The insider also claimed that the Elektra lead — who's still with on-again, off-again boyfriend John Miller — may even attend the upcoming nuptials. "She is a part of Ben’s family and there is no reason why she wouldn’t be invited. Whether or not she will go is up to her," stated the source. "She has gotten rather close with J.Lo and the two of them are on speaking terms for sure. They know that this is important to their children.”