Erin Andrews takes time off… Naomi Watts and Liev Schreiber split… Kendall Jenner’s 21st birthday… Rob Kardashian lashes out… and Selena Gomez has secretly checked into rehab

Erin Andrews is taking the week off to be with her NHL player boyfriend Jarret Stoll, who recently lost his nephew. Last night, Tom Bergeron hosted an abbreviated version of “Dancing With the Stars,” but for the results show tonight, he’ll be joined by Kym Johnson. Kym is a DWTS pro, but she’s not competing this season. She’s been hosting the show’s live online interviews, instead. Kym recently married Robert Herjavec from “Shark Tank.” They met when they were partnered together during season 20 of DWTS.

After 11 years and two kids, Naomi Watts and Liev Schreiber are calling it quits. They issued a joint statement saying, “Over the past few months we’ve come to the conclusion that the best way forward for us as a family is to separate as a couple. It is with great love, respect and friendship in our hearts that we look forward to raising our children together and exploring this new phase of our relationship.” The Post is reporting that the split is beyond amicable and they won’t even be using lawyers. Naomi and Live never married, but they have two children, 8-year-old Alexander Pete and 7-year-old Samuel Kai.

The top clubs in Vegas reportedly are in a bidding war to host Kendall Jenner’s 21st birthday, which is coming up November 3. Page Six is reporting that the bidding is up to a million dollars and could go higher! One source says Kendall is “the biggest 21st birthday ‘get’ since Justin Bieber” and that the money is “already at Bieber levels.” Of course, they’re also taking into account that along with Kendall comes a lot of potential tagalongs, including her best friend Gigi Hadid, the Kardashians, and possibly Harry Styles!

Rob Kardashian is very upset and is lashing out the only way he knows how — on social media. He tweeted, “Didn’t invite the Mother of my child to a baby shower you all were trying to throw for me ‼️? You all must have lost your damn minds.” To get revenge, he tweeted:

Kylie's # +1 (818) 482-5859 😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂 I ain't hacked either this is rob dog lol

— ROBERT KARDASHIAN (@robkardashian) September 27, 2016

None of the Kardashians have responded to Rob’s outburst and Kylie has already changed her number. But it’s interesting to note that earlier Monday before Rob’s tweets, Blac Chyna posted on Snapchat a text image that said, “My baby shower is Sunday.”

RadarOnline.com is reporting that Selena Gomez secretly checked into a top rehab facility on the East Coast earlier this month to deal with her emotional and health issues. Selena suffers from lupus. Last month when she announced she was canceling the remainder of her “Revival” tour, she explained, “I want to be proactive and focus on maintaining my health and happiness and have decided that the best way forward is to take some time off.” A source told Radar that Selena checked into a women’s only, Christian-based facility where she is expected to remain for more than 60 days. The source insists she is NOT being treated for drug-related problems, saying the root cause of her issues are related to lupus and depression.